Answer:
Black color absorbs heat more quickly and it also emits heat at a faster rate.
Whereas silver is one of the best conductor of heat and electricity. Therefore, it absorbs heat more quickly but it does not emit heat at a faster rate.
Therefore, we can conclude that the statement black pot emits heat at a faster rate than the silver pot best explains that black pot is significantly cooler than the water in the silver pot.
Explanation:
Hope this helps :)
Final answer:
The black pot cools faster than the silver pot because black emits infrared radiation more efficiently, thereby losing heat quicker.
Explanation:
The difference in the temperature of the water in the two identical pots, one black and the other silver, after being heated and left to cool in the same room, can be explained by the properties of radiative heat transfer. Darker colors, especially black, are known to radiate heat more efficiently than lighter colors. This means that the black pot will emit more infrared radiation than the silver pot and thus cool down faster. Both pots start at the same temperature, and given identical conditions aside from color, the differing cooling rates are due to how effectively each color emits heat as radiation.
What kinds of information does the ALMA radio telescope provide?
Answer:
ALMA is a trans-formative radio telescope that can study cosmic light that straddles the boundary between radio and infrared. Most objects in the Universe emit this kind of energy, so the ability to detect it has been a driver for astronomers for decades.
Explanation:
Answer:
the location of dust and gases in space
places where stars will be born
Explanation:
A student adds 5 grams of sugar to 1 liter of water one sugar solution. Then, they add 10 grams of sugar to 1 liter of water to make another sugar solution. Which statement correctly compares these solutions?
The solution with 10 grams of sugar per liter is hypertonic to the one with 5 grams of sugar per liter. Comparatively, the solution with 45 grams of sugar in 100 mL of water is much more hypertonic than both. The cup with more sugar has less water compared to the cup with less sugar due to the displacement of water by sugar.
When comparing two sugar solutions with different amounts of sugar but the same volume of water, the solution with more sugar is considered hypertonic, and the one with less sugar is hypotonic. In the given scenario, a student created two solutions by dissolving different amounts of sugar in equal volumes of water. The first solution with 5 grams of sugar is hypotonic compared to the second solution, which has 10 grams of sugar in the same volume of water (1 liter), making the second solution hypertonic to the first.
To further illustrate this with a different example, if you have 100 mL of water and add 45 grams of sugar, you will have a more concentrated (hypertonic) solution compared to a solution where you add a lesser amount of sugar to the same volume of water. This is because the hypertonic solution has a greater solute concentration. Comparatively, the solution with lesser sugar concentration, in this case, 5 grams per liter, would be hypotonic to the one with higher sugar concentration, which is 10 grams per liter or even more substantially to the one with 45 grams in 100 mL.
Therefore, when the volume is the same, the cup with the larger amount of sugar has less water due to the space taken by the sugar, and vice versa. This scenario is another way to understand the concept of hypertonic and hypotonic solutions based on solute concentration and the displacement of the solvent (water) by the solute (sugar).
Trudy writes an expression to calculate the mass defect of a carbon-14 nucleus using the symbols in the table.
A 2 column table with 4 rows. The first column is labeled quantity with entries mass of carbon-14 nucleus, mass of proton, mass of neutron, mass of electron. The second column is labeled symbol with entries m Subscript C-14 baseline, m Subscript p baseline, m Subscript n baseline, m Subscript e baseline.
Which expression should Trudy write?
(6mp + 8mn) – mc – 14
(8mp + 6mn) – mc – 14
mp + mn – mc – 14
6mp + 8me – mc – 14
Answer:
A
Explanation:
ED GU NU IT Y PE OP LE
The mass defect of a carbon-14 nucleus is (6mp + 8mn) – mc – 14.
To find the correct option among all the options, we need to know about the mass defect.
What is mass defect?There is a mass difference arises between the individual sum of masses of nucleons and the mass of nucleus.This mass defect is responsible for the bonding of nucleons in the nucleus. I.e. energy corresponding to the mass defect is the binding energy of the nucleus.What is the mathematical formulation of mass defect?Mathematically, mass defect is given as
∆m = mass of all nucleons - mass of nucleus
= Mass of protons + mass of neutrons - mass of nucleus
Thus, we can conclude that the option (a) is correct.
Learn more about the mass defect here:
brainly.com/question/16485729
#SPJ2
Measurements of how orbital speeds depend on distance from the center of our galaxy tell us that stars in the outskirts of the galaxy (a) orbit the galactic center just as fast as stars closer to the center. (b) rotate rapidly on their axes. (c) travel in straight, flat lines rather than elliptical orbits.
Answer:
(a) orbit the galactic center just as fast as stars closer to the center.
Explanation:
The orbital speed is defined as:
[tex]v = \sqrt{\frac{G M}{r}}[/tex]
Where v is the orbital speed, G is the gravitational constant, M is the mass of the supermassive black hole, and r is the orbital radius.
If the distance increase the orbital speed decreases (inversely proportional).
However, the results of the measurements of the orbital speed of the star in the outskirts of the Milky way show that in fact, they orbit the galactic center as fast as the star closer to the center.
Dark matter in the other hand was born to explain why stars that were farther from the supermassive black hole in the center of the Milky Way galaxy didn't decrease its orbital speed as it was expected since the contribution of more matter in that region is the only explanation to that weird behavior.
What is the net force acting on a falling 1-kg ball if it encounters 2 n of air resistance?
Answer:
Net Force= -7.8N
Explanation:
fist start by solving the weight of the ball, this means the force pushing the ball down and the mass of the ball combined. we know that the force acting on the ball is gravity. the force of gravity is equivalent to 9.8m/s^2
weight formula w=mg. w= weight m= mass g= gravity
w=1kg(9.8m/^2)
w=9.8kg.m/s^2
w=9.8N
Simply add the two forces together to get the net force. The weight 9.8N is negative since it is directed downwards, while the air resistance 2N is positive since it is directed upwards.
Fnet= -9.8N+2N
Fnet= -7.8N
A 1-kg ball falling to the earth experiences a gravitational force of 9.8 N. With air resistance of 2 N, the net force acting on the body is 7.8 N.
Explanation:
The net force acting on a 1-kg ball falling due to gravity can be calculated by using Newton's second law. The gravitational force (weight) is equal to the mass times the gravity acceleration on Earth's surface. Thus, it is 1 kg times 9.8 m/s^2, which equals 9.8 N. However, the object encounters air resistance of 2 N, therefore, the net force on the object would be the gravitational force minus the air resistance: 9.8 N - 2 N = 7.8 N.
Learn more about Net Forcehttps://brainly.com/question/33730566
#SPJ11
Which weather instrument is used to measure air temperatures recorded on a weather map?
Answer:
Thermometer
Explanation:
Hence the name Thermo meaning heat.
A 1.50-kg iron horseshoe initially at 550°C is dropped into a bucket containing 25.0 kg of water at 20.0°C. What is the final temperature of the water–horseshoe system? Ignore the heat capacity of the container and assume a negligible amount of water boils away.
Answer:
Te = 23.4 °C
Explanation:
Given:-
- The mass of iron horseshoe, m = 1.50 kg
- The initial temperature of horseshoe, Ti_h = 550°C
- The specific heat capacity of iron, ci = 448 J/kgC
- The mass of water, M = 25 kg
- The initial temperature of water, Ti_w = 20°C
- The specific heat capacity of water, cw = 4186 J/kgC
Find:-
What is the final temperature of the water–horseshoe system?
Solution:-
- The interaction of horseshoe and water at their respective initial temperatures will obey the Zeroth and First Law of thermodynamics. The horseshoe at higher temperature comes in thermal equilibrium with the water at lower temperature. We denote the equilibrium temperature as (Te) and apply the First Law of thermodynamics on the system:
m*ci*( Ti_h - Te) = M*cw*( Te - Ti_w )
- Solve for (Te):
m*ci*( Ti_h ) + M*cw*( Ti_w ) = Te* (m*ci + M*cw )
Te = [ m*ci*( Ti_h ) + M*cw*( Ti_w ) ] / [ m*ci + M*cw ]
- Plug in the values and evaluate (Te):
Te = [1.5*448*550 + 25*4186*20 ] / [ 1.5*448 + 25*4186 ]
Te = 2462600 / 105322
Te = 23.4 °C
Answer:
Final temperature = 23.4 °C
Explanation:
The idea here is that the heat lost by the metal will be equal to the heat gained by the water.
In order to be able to calculate the final temperature of the iron + water system, we need to know the specific heats of water and iron which are;
C_water = 4.18 J/g°C
C_iron = 0.45 J/g°C
The formula to determine the determine the amount of heat lost or gained is given by;
q = m•c•ΔT
q = heat lost or gained
m = the mass of the sample
c = specific heat of the substance
ΔT = the change in temperature, defined as final temperature minus initial temperature
Now, -q_water = q_iron
The negative sign is used here because heat lost carries a negative sign. Let's say that the final temperature of the iron + water system will be T_f
Thus, we can say that the changes in temperature for the iron and for the water will be;
ΔT_iron = T_f − 550 °C
and ΔT_water = T_f − 20 °C
This means that we will now have;
−m_iron•c_iron•ΔT_iron = m_water•c_water•ΔT_water
This now gives us ;
−m_iron•c_iron•(T_f − 550°C) = m_water•c_water•(T_f − 20°C) - - - - (eq1)
Notice that the specific heats for these two substances is given per gram. This means that you will have to
Mass of iron = 1.5 kg = 1500g
Mass of water = 25 kg = 25000 g
Plugging the relevant values into eq(1),we have;
−(1500g)•(0.45 J/g°C)•(T_f − 550°C) = (25000 g)•(4.18 J/g°C)•(T_f − 20°C)
Multiplying out to get;
-675(T_f − 550) = 104,500(T_f − 20)
-675T_f + 371,250 = 104,500T_f - 2090000
371,250 + 2090000 = 104,500T_f + 675T_f
2461250 = 105175T_f
T_f = 2461250/105175 = 23.4 °C
Two people push on a boulder to try to move it. The mass of the boulder is 825 kg. One person pushes north with a force of 64 N. The other pushes west with a force of 38 N. Predict the magnitude of the acceleration of the boulder. Assume that friction is negligible.
Answer:
0.09 m/s²
Explanation:
Acceleration: This can be defined as the rate of change of velocity.
The S.I unit of acceleration is m/s².
From the question, expression for acceleration is given as
F' = ma
Using Pythagoras Theory,
√(F₁²+F₂²) = ma................... Equation 1
Where F₁ = Force of the First person on the boulder, F₂ = Force of the Second person on the boulder, F' = resultant force acting on the boulder, m = mass of the boulder, a = acceleration of the boulder.
make a the subject of the equation
a = √(F₁²+F₂²) /m................ Equation 2
Given: m = 825 kg, F₁ = 64 N, F₂ = 38 N,
Substitute into equation 2
a = [√(64²+38²)]/825
a = {√(5540)}/825
a = 74.43/825
a = 0.09 m/s²
The magnitude of the acceleration of the boulder, with a mass of 825 kg being pushed with forces of 64 N northward and 38 N westward, is approximately 0.09 m/s² assuming negligible friction.
To predict the magnitude of the acceleration of the boulder, we can use Newton's second law of motion, which states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (a = F/m). Since the forces are applied in perpendicular directions (north and west), we can treat them as components of a resultant force vector and calculate the resultant force using Pythagoras' theorem: Fr = sqrt(Fn² + Fw²), where Fn is the northward force and Fw is the westward force.
By plugging the given values into the equation, we get Fr = √((64 N)² + (38 N)²) = √(4096 + 1444) = √(5540) N ≈ 74.43 N. We then divide this resultant force by the mass of the boulder to find the acceleration: a = Fr / m = 74.43 N / 825 kg ≈ 0.09 m/s².
The magnitude of the acceleration of the boulder, assuming negligible friction, is approximately 0.09 m/s².
How many brain’s does a human brain have? hehe
Answer: one brain... humans have one brain
Explanation: humans have many parts of the brain but they only have one brain there are left brain right brain people. Right brain tends to me more creative and left brain is more logical but its is all still the same brain you just use different parts of the brain at one time
Global Precipitation Measurement (GPM) is a tool scientists use to forecast weather. Which statements describe GPM? Select three options.
Answer:
B.It is a satellite that collects data about rain and snow
C.Its orbit covers 90 percent of Earth’s surface
F.The sensors measure microwaves
Answer: B, C, F
Explanation:
I got it right
-science
Which is true?variations great horned owl body size due to food supply can or cannot be acted on by natural selection.
Which is true variation in body size due to inherited traits can/cannot be acted on by natural selection
Answer:
variations in great horned owl body size due to food supply can be acted on by natural selection.
Explanation:
Natural selection can help select great horned owl with smaller body size since it's an advantage in a place with smaller available food sources, compared to a bigger body size that will need more food. At first, birds with smaller body survive while those bigger ones die out, and the smaller birds pass on this genes to their offspring.
Answer:
variation in body size due to inherited traits can be acted on by natural selection
Explanation :
Variations in body size in body size due to inherited trait can be acted upon by natural selection by favoring the size that is best suited for the survival of the species. Those with these genes survive and pass it on to their offspring, while those with the unfavorable body size are wiped out.
Variations in body size of the Great Horned Owl can be acted on by natural selection, both due to food supply and inherited traits.
Explanation:Variations in body size of the Great Horned Owl due to food supply can be acted on by natural selection. When there is a shortage of food, smaller individuals with less energy requirements may be favored, while in times of plenty, larger owls with higher energy needs may have an advantage. On the other hand, variation in body size due to inherited traits can also be acted on by natural selection.
Learn more about Variations in body size of Great Horned Owls here:https://brainly.com/question/31489960
#SPJ3
. A 65 kg climber on top of Mt. Everest (8800 m high). How much Pontential Energy does he have?
Answer:
He has 5,609,404 J of potential energy
Explanation:
P.E. = M*G*H
65 * 9.8^2 * 8800
The potential energy of the climber weighing 65 kg at a height of 8800 m is 5.6 × 10⁶ Joules.
What is potential energy?Potential energy of a body is generated by virtue of its position. It is the form of energy stored in an object when it is stationary. When the body stopes its motion, its kinetic energy converts to potential energy.
The potential energy is related to the mass and height of the object from the ground and to the acceleration due to gravity g, by the expression,
PE = m g h.
Given that, mass of the climber = 65 Kg
Height of the mountain = 8800 m
g = 9.8 m/s²
Thus, PE = 65 kg × 8800 m × 9.8 m/s² = 5.6 × 10⁶ Joules.
Therefore, the potential energy of the climber will be 5.6 × 10⁶ Joules.
To find more on potential energy, refer here:
https://brainly.com/question/24284560
#SPJ3
The small piston of a hydraulic lift, has an area of 0.01m2. If a force of 250N is applied to the small piston if it has an area of 0.05m2.
Critical Thinking
Answer:
Explanation:
Given that,
Small piston Hydraulic piston has an area
A1 = 0.01m²
If the force applied is 250N is applied to the small piston at an area of 0.05 m²
Then,
F2 = 250 N and A2 = 0.05m²
Then, applying pascal principle,
Pressure at small area = pressure are bigger area
P1 = P2
F1 / A1 = F2 / A2
F1 / 0.01 = 250 / 0.05
F1 / 0.01 = 5000
Cross multiply
F1 = 5000 × 0.01
F1 = 50 N
Answer:
50N
Explanation:
Pressure = Force/Area
Where P1 = P2
F1/A1 = F2/A2
Given that F1 =? A1 = 0.01m^2
F2= 250N A2= 0.05m^2
F1/0.01m^2 = 250N/0.05m^2
F1 × 0.05= 0.01 × 250
F1 = 0.01×250/0.05
F1 = 2.5/0.05
F1 = 50N
Electromagnetic waves are often distinguished from mechanical waves. The distinction is based on the fact that electromagnetic waves ______. *
A)can travel through materials and mechanical waves cannot
B)come in a range of frequencies and mechanical waves exist with only certain frequencies
C)can travel through a region void of matter and mechanical waves cannot
D)electromagnetic waves cannot transport energy and mechanical waves can transport energy
Answer:
The answer is electromagnetic waves can travel through a region void of matter and mechanical waves cannot (option C)
Explanation:
To begin with, electromagnetic waves are waves that are created due to vibrations between a magnetic and electric field. On the other hand, mechanical waves are waves that are created due to vibration in matter or energy transfer through a material medium.
Electromagnetic waves are quite distinct from mechanical waves because the latter requires a material medium to transport energy while the former does not. In fact, electromagnetic waves can carry out transportation of energy through the vacuum of outer space.
Two technicians are discussing ignition coils. Technician A says that some ignition coils have the primary and secondary windings electrically connected. Technician B says that some coils have totally separate primary and secondary windings that are not electrically connected. Which technician is correct?
Answer:
Technician B is actually correct
The automobile Ignition systems have two circuits that result in a spark being fired at the end of a spark plug. The primary circuit is between the battery and the ignition coil. The secondary circuit is between the ignition coil and the spark plug.
Explanation:
1. The primary circuit carries low voltage. This circuit operates only on battery current and is controlled by the breaker points and the ignition switch. When the ignition key is turned on, a low voltage current from the battery flows through the primary windings of the ignition coil, through the breaker points and back to the battery. This current flow causes a magnetic field to form around the coil.
2. The secondary circuit consists of the secondary windings in the coil, the high tension lead between the distributor and the coil on external coil distributors, the distributor cap, the distributor rotor, the spark plug leads and the spark plugs. As the engine rotates, the distributor shaft cam turns until the high point on the cam causes the breaker points to separate suddenly. Instantaneously, when the points open (separate) current flow stops through the primary windings of the ignition coil. This causes the magnetic field to collapse around the coil. The condenser absorbs the energy and prevents arcing between the points each time they open. This condenser also aids in the rapid collapse of the magnetic field.
Complete the ray diagram for an object in front of a lens to show how to find the location and size of the image from the location and size of the object. F labels the focal points of the lens.
In this case draw all the rays needed to locate the object, then state whether the image is real or virtual, and upright or inverted.
Draw directly on the incomplete diagram provided.
Answer:
Answer:
Image is real and inverted
Explanation:
The ray diagram representing the situation is shown in attachment.
In this problem, we have a convex lens, which is curved outward at its centre; the rays of light reaching the lens parallel to the principal axis are refracted into the focal point of the lens.
Therefore, in order to build the ray diagram of this situation and draw the image, we proceed as follows:
1) First, we draw a ray of light parallel to the principal axis and going from the tip of the object towards the lens, then this ray is refracted towards the focal point on the other side
2) Then, we draw another ray of light going from the tip of the object towards the centre of the lens and continuing on the other side of the lens
The intersection point of rays 1) and 2) gives the position of the tip of the image.
Looking at the attached figure, we see that the image is:
- Real, because it is produced on the other side of the lens
- Inverted, as it is upside down
When the rays are drawn so here the Image should be considered as real and inverted.
Ray diagram:Since it is the convex lens that curved outward at the center. Here the rays of light should be reached the lens that parallels to the principal axis also it should be refracted into the focal point of the lens.
Also, the first ray of light should be drawn, then the other ray of light should be gone from the tip of the object. It should be real since it is generated on the other side of the lens. And, it should be inverted since it is upside down.
Learn more about ray here; https://brainly.com/question/12449404?referrer=searchResults
The wavelength of a waterwave is 4.0 X 10^2 m. The wave approaches land at 25 m/s what is the period of the wave?
In 1970, a rocket powered car called Blue Flame achieved a maximum speed of 1.00(10 km/h (278m/s).Suppose the magnitude of the car's constant acceleration is 5.56 m/s^2. If the car is initially at rest , what is the distance traveled. During its acceleration?
Answer:
Distance traveled during this acceleration will be 6950 m
Explanation:
Wear have given maximum speed tat will be equal to final speed of the car v = 278 m/sec
Constant acceleration [tex]a=5.56m/sec^2[/tex]
As the car starts initially starts from rest so initial velocity of the car u = 0 m/sec
From third equation of motion [tex]v^2=u^2+2as[/tex]
Putting all values in equation
[tex]278^2=0^2+2\times 5.56\times s[/tex]
s = 6950 m
So distance traveled during this acceleration will be 6950 m
What is the average speed of a train that covers 80 km in 1 h, 200 km in 2 h, and 420 km in 4 h?
Answer:
the answer is in the question 80 km in an hour
Explanation
The average speed of a train that travels 80 km in 1 hour, 200 km in 2 hours, and 420 km in 4 hours is 100 km/h, calculated by dividing the total distance (700 km) by the total time (7 hours).
The student is asking about how to calculate the average speed of a train that covers different distances over different time intervals. To find the average speed, we need to combine the total distance traveled with the total time taken.
First, we add up all the distances: 80 km + 200 km + 420 km = 700 km.
Then, we add up all the time intervals: 1 h + 2 h + 4 h = 7 h.
Finally, we divide the total distance by the total time to get the average speed:
Average speed = Total distance / Total time = 700 km / 7 h = 100 km/h.
The average speed of the train over the entire journey is 100 km/h.
Most of the mass of the solar system is located in
Answer:
The sun
Explanation:
somewhere between 99.8 and 99.9 percent. The rest is split between the planets and their satellites, and the comets and asteroids and the dust and gas surrounding our star.
Billions of stars in the same region of the universe are called
You are 2.4 m from a plane mirror, and you would like to take a picture of yourself in the mirror. You need to manually adjust the focus of the camera by dialing in the distance to what you are photographing. What distance do you dial in
Answer:
4.8 m
Explanation:
A mirror is a reflecting surface on which rays of light are reflected. Reflection occurs when a ray of light bounces off a surface, coming back into the original medium.
There exists two types of mirrors:
- Flat mirrors: they consist of a flat surface
- Curved mirrors: they consist of curved surfaces. They are further divided into convex mirrors and concave mirrors.
For a flat mirror, the image produced from the mirror is always:
- Virtual (on the other side of the mirror)
- Of the same size as the object
- Laterally inverted
- Upright (same orientation as the object)
Moreover, the image produced by a flat mirror is at the same distance from the mirror as the object.
So in this case, since the person is 2.4 m from the mirror, then the image is produced 2.4 m from the mirror (but on the other side).
This means that the total distance between you and your image in the mirror is:
d = 2.4 + 2.4 = 4.8 m
Therefore, the focus of the camera must be adjusted to be at 4.8 m.
Olivia wants to find out whether a substance will fluoresce. She says she should put it in a microwave oven. Do you agree with her? Why or why not?
Answer:
In disagreement
Explanation:
Fluorescence can be defined as the phenomenon by which an object emits visible light when placed in front of ultraviolet light. In fluorescence, the absorbed light increases the energy band of the electrons, causing them to go into a more excited state. The electrons, before they release the absorbed energy in the form of light, lose a part of the energy due to the vibration of the molecules. When they return to their initial state, the electrons will emit light.
While microwaves are electromagnetic waves whose frequency is high, and are used for the transmission of high-speed telegraphic signals and for the communication of satellites and do not emit light.
Sample Response: I disagree with her because many substances show fluorescence under ultraviolet light, not microwaves.
edge
A machine part has the shape of a solid uniform sphere of mass 240 g and diameter 4.50 cm . It is spinning about a frictionless axle through its center, but at one point on its equator it is scraping against metal, resulting in a friction force of 0.0200 N at that point. Find its angular acceleration. Let the direction the sphere is spinning be the positive sense of rotation. How long will it take to decrease its rotational speed by 28.0 rad/s ?
1) [tex]-9.3rad/s^2[/tex]
2) 3.0 s
Explanation:
1)
The angular acceleration of a rigid body in rotation can be found by using the equivalent of Newton's second law for rotational motions:
[tex]\tau = I\alpha[/tex] (1)
where
[tex]\tau[/tex] is the torque on the object
I is the moment of inertia of the object
[tex]\alpha[/tex] is the angular acceleration
Here we have:
[tex]I=\frac{2}{5}MR^2[/tex] is the moment of inertia of a solid sphere about its central axis, where
M = 240 g = 0.240 kg is the mass of the sphere
R = 4.50 cm /2= 2.25 cm = 0.0225 m is the radius of the sphere
[tex]\tau = F r[/tex] is the torque exerted by the frictional force, where
[tex]F=-0.0200 N[/tex] is the force of friction (negative because the direction is opposite to the motion)
r = R = 0.0225 m is the distance of the point of application of the force from the centre
Substituting into eq(1) we find
[tex]FR=\frac{2}{5}MR^2 \alpha[/tex]
And solving for [tex]\alpha[/tex], we find the angular acceleration:
[tex]\alpha = \frac{5F}{2MR}=\frac{5(-0.0200)}{2(0.240)(0.0225)}=-9.3rad/s^2[/tex]
2)
Here we know that the motion of the sphere is an angular accelerated motion.
Therefore, we can use the equivalent of suvat equations for rotational motion:
[tex]\omega_f = \omega_i +\alpha t[/tex]
where
[tex]\omega_f[/tex] is the final angular velocity
[tex]\omega_i[/tex] is the initial angular velocity
[tex]\alpha[/tex] is the angular acceleration
t is the time
In this problem, we know that
[tex]\omega_f-\omega_i = -28.0 rad/s[/tex], since we are told that the rotational speed decreases by 28.0 rad/s
[tex]\alpha=-9.3 rad/s^2[/tex] is the angular acceleration of the sphere
Solving for t, we find how long it takes for the sphere to decelerate by 28.0 rad/s:
[tex]t=\frac{\omega_f - \omega_i}{\alpha}=\frac{-28.0}{-9.3}=3.0 s[/tex]
Demagnetize
Which events cause ferromagnetic materials to magnetize and which events cause them to demagnetize?
Answer:
Magnetize: place in magnet field, rub on permanent magnet, pass electricity through
Demagnetize: heat, strike, place in opposite polarity
Explanation:
Final answer:
Ferromagnetic materials can be magnetized by aligning their magnetic domains with an external magnetic field, which may become permanent, making them permanent magnets. Demagnetization occurs when these domains are misaligned due to heat, physical disturbance, or an opposing magnetic field.
Explanation:
Ferromagnetic materials such as iron, cobalt, nickel, and gadolinium exhibit strong magnetic effects. These materials can become magnetized in the presence of an external magnetic field due to the alignment of their magnetic domains. Magnetization occurs when the domains within the ferromagnetic material align with the magnetic field lines, and this alignment can become permanent, turning the material into a permanent magnet. Conversely, demagnetization can occur when these domains lose their alignment, often due to factors such as heat, hammering, or an opposing magnetic field.
Demagnetization typically happens when the material is heated to its Curie temperature, at which point the ferromagnetism disappears. Alternatively, demagnetization can occur when the material is exposed to an external magnetic field in a direction opposite to the magnet's existing fields, or through physical disturbance such as dropping or hammering.
The International Electrotechnical Commission (IEC) is the predominant organization for developing and publishing international standards for technologies related to electrical and electronic devices and processes.
A. True
B. False
Answer:
The correct option is A (TRUE)
Explanation:
International Electrotechnical Commission (IEC) which was first formed in 1906 is the predominant organization for developing and publishing international standards for technologies related to electrical and electronic devices and processes. The standards developed by this association are widely used in scientific fields such as power generation, semiconductors, fibre optics, batteries, solar energy, nanotechnology and marine energy. They also proposed the International System of Units( SI unit) used in many fields of study today.
Why do photons take so much longer than neutrinos to emerge from the sun?
Answer:
Because of the strong interaction of photons with matter,neutrinos rarely interact with matter
Explanation:
In the core of the sun,nuclear fusion which is a nuclear reaction,produces the photons and neutrinos,for photons to emerge from the sun's core it passes through denser particles colliding and losing energy as it moves at such it can take it up to a million years to emerge from the sun core.Unlike the neutrinos that has more easier path,with little or no collission.
Photons take a long time to exit the sun due to repeated absorption and re-emission by atoms, resulting in a slow, zigzag path. On the other hand, neutrinos, which interact weakly with matter, can pass straight through the sun rapidly, taking just a bit over 2 seconds.
Explanation:The reason why photons take much longer than neutrinos to emerge from the sun is due to their interactions with atoms inside the sun's dense core. When photons, which are energy particles produced by nuclear reactions, try to exit the sun, they end up getting absorbed or scattered by atoms, resulting in their paths being zigzag or random. This absorption and reemission process significantly slows down their journey, causing it to take between an estimated 100,000 to 1,000,000 years for them to reach the surface.
On the other hand, neutrinos, another type of particle produced by nuclear reactions, interact minimally with matter. This weak interaction enables them to pass straight through the sun's interior, reaching its surface in a little over 2 seconds. While photons eventually give up enough energy to become visible light that we see as sunlight, neutrinos escape the sun and radiate into space almost immediately after they're created.
Learn more about Photon and Neutrino Paths here:https://brainly.com/question/33944307
#SPJ12
PLEASE HELP ASAP!
1. What is the velocity of a 50 kg teen running with 250 kg*m/s of momentum?
2. What is the mass of a truck with 20500 kg*m/s of momentum that’s moving at 205 m/s?
Answer:
Velocity of the teen = 5m/s
Mass of the truck = 100kg
Explanation:
Momentum can be found with the equation
P = m * v
Where P is momentum in kg*m/s, v is velocity in m/s and m is mass in kg.
Substitute in our values and solve for the unknowns
1.) P = m * v
250 = 50 * v
Divide both sides of the equals by 50 to solve for v
250/50 = v * 50/50
v = 5m/s
2.) P = m * v
20500 = m * 205
Divide both sides of the equals by 205 to solve for m
20500/205 = m * 205/205
m = 100kg
A force of 8 N is used to drag a chair 2.5 metres across a room. Calculate the work done to move the chair.
Answer:
Explanation:
GIVEN
Force (F) = 8 N
Distance (d) = 2.5 metres
Work done = ?
WE know we have the formula
work done = F * d
Work done = 8 * 2.5
= 20 Joule
Hope it helps :)
Work is measured in Joule. The work done by the given chair is 20 J.
Work:
It is defined as the amount change in the energy. It is the product of force applied and displacement due to force.
Formula for work,
W = F x d
Where,
F - Force applied = 8 N
d - Distance = 2.5 meters
W - Work done = ?
Put the values in the formula,
[tex]\bold {W = 8\times 2.5 }\\\\\bold {W = 20\ J}[/tex]
Therefore, the work done by the given chair is 20 J.
To know more about work,
https://brainly.com/question/19604436
After soccer practice coach Miller goes to the roof of the school to retrieve the event soccer balls the height of the school is 3.5 m a soccer ball which leaves the roof with only a horizontal velocity of 15 m/s in the ignoring air resistance how far is the ball above the ground at 0.32 seconds
Final answer:
Using the equations of projectile motion and accounting for the initial height of 3.5 m, we find that the soccer ball is approximately 2.4 m above the ground at 0.32 seconds after being kicked horizontally from the roof.
Explanation:
To determine how far above the ground the soccer ball is at 0.32 seconds after being kicked horizontally from a height of 3.5 m, we can use the equations for projectile motion. Specifically, we only need to consider the vertical motion because the horizontal velocity does not affect the height at which the ball is above the ground.
The vertical position of the ball (y) at any time (t) can be given by:
y = y0 + (v0y · t) + (½ · g · t²)
Where:
y0 = initial vertical position
v0y = initial vertical velocity (0 m/s for horizontal launch)
g = acceleration due to gravity (approximately -9.8 m/s²)
t = time (0.32 s in this case)
Given that the ball is launched from the roof horizontally, the initial vertical velocity (v0y) is 0 m/s, and the initial height (y0) is 3.5 m. Plugging in the values:
y = 3.5 m + (0 m/s · 0.32 s) - (½ · 9.8 m/s² · (0.32 s)²)
Upon simplifying, we find that the ball is approximately 2.4 m above the ground at 0.32 seconds.