Answer: the answer is D if you do t wanna read all that
What is speed?
A. Distance (miles or meters)
B. Time (hours or seconds)
C. Time per distance (hours per mile or seconds per meter)
D. Distance per time (miles per hour or meters per second)
Materials in which electric charges move freely such as copper and aluminum are called
Answer:
Conductors allow electric charges to move freely
What kind of lenses are in a light microscope
Light microscopes use glass or plastic lenses to magnify specimens, consisting of an objective lens and an eyepiece. They can magnify up to 2000 times, but the resulting image is upside-down and reversed. Staining may be required for transparent cell components, although this often kills the cells.
Explanation:The lenses found in a light microscope are typically made of glass or plastic and are designed to focus light on the specimen to produce an image. The most basic type is the compound microscope which consists of two main types of glass lenses: the objective lens and the eyepiece or ocular lens. The objective lens, which is near the specimen, often has a range of magnification powers from 5x to 100x. These objective lenses are usually parfocal, meaning they are set up so that the sample remains in focus when the objectives are switched. The eyepiece then further magnifies this image. Together, these lenses allow for a significant magnification of the specimen, causing an upside-down and reversed image due to the nature of the optics involved. Light microscopes are commonly used because they are suitable for viewing living organisms, but sometimes staining is necessary to make transparent cell components visible, which usually results in the death of the cells.
When astronomers observe the spectra of distant galaxies,they notice that the hydrogen emission lines are shifted noticeably toward the red end of the visual spectrum,a phenomenon called red shift. Red is lowest frequency of visible light. What does red shift indicate about the movement of the distant galaxies?
A redshift in the spectra of distant galaxies indicates that these galaxies are moving away from us due to the expansion of the universe. This discovery by Edwin Hubble has given astronomers a way to determine the distance of galaxies and observe the universe's evolution and age.
Explanation:The redshift observed in the spectra of distant galaxies indicates that these galaxies are moving away from us. This is a result of the Doppler Effect, a phenomenon that causes a wave's frequency to appear different than its original frequency due to the relative motion of the source and observer. The higher the redshift - the more the hydrogen emission lines are displaced to the red end of the spectra - the faster the galaxies are receding.
In 1929, astronomer Edwin Hubble observed this redshift and found it was proportional to the galaxies' distance from us, which led him to conclude that the universe is expanding. This means not only are galaxies moving away from us, but the space within the universe itself is increasingly getting larger.
This discovery has offered astronomers crucial insights into the age and evolution of the universe. The amount of redshift can be used to determine the distance to a galaxy, and consequently, looking at the redshifted light enables astronomers to 'look back' in time and see the state of the universe billions of years ago.
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In the circuit seen here, the resistor has a resistance of 3 ohms. If no change in the battery size occurs, what will happen to the current if the resistance increases to 6 ohms?
it decreases by a factor of 2
In a series circuit, the resistors are arranged in a series and where, the current is inversely proportional to the resistance. Thus when resistance is increased to 6 ohm current will decreases to half.
What is resistance?Resistance is a physical quantity and is the measure of resistance to the current. It has a unit called Ohm. The device which is used to measure the resistance in a circuit is called a resistor.
According to Ohm's law, the product of current and resistance in a circuit is the voltage or potential difference in the circuit V.
I.e., V = I R.
As per this relation it is clear that the resistance and current in a circuit are in inverse proportionality. Therefore we have the equation relation them as:
I1/ I2 = R2/ R1
It is given that the initial resistance of 3 ohm increased to 6 ohm. Thus current will decrease there to half since resistance is increase to double.
Therefore, current will reduces to half of its initial value.
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If the batteries in a portable cd player provide a terminal voltage of 12.0 v, what is the potential difference across the entire cd player?
The First Telescopes created relied on the bending of the light to see objects in the night sky. This type of telescope is called ?
A. Reflecting Telescope
B. Radio Telescope
C. Refracting Telescope
D. Space Telescope
which describes the relationship between photon energy and frequency?
high energy photons have high frequencies hope this helps brother
A car moved a total distance of 120 km in 90 minutes. What was the speed of the car?
Answer:
80 km/hr
Explanation:
We are given that
Total distance covered by the car=120 Km
Time taken by the car=90 minutes=[tex]\frac{90}{60}=1.5 hour[/tex]
We have to find the speed of the car
We know that Speed=[tex]\frac{Distance}{time}[/tex]
Substitute the value then, we get
Speed=[tex]\frac{120}{1.5}=80 Km per hour[/tex]
Hence, the speed of the car=80 km per hour.
A car is travelling at 20 km/hr.It speeds upto 60 km/hr in 6 seconds.What is its acceleration?
A person on earth would weigh a lot more on the sun due to increased ________________. gravity mass atoms energy
Answer:
Gravity
Explanation:
The weight of a person is given by :
W = m g
Where
m is the mass of the person
g is acceleration due to gravity.
Weight of the person depend on the value of acceleration due to gravity. The mass of the person remains the same in every location. On the surface of earth it is equal to 9.8 m/s². While on surface of sun it is equal to 274 m/s².
Hence, a person on earth would weigh a lot more on the sun due to increased gravity.
If you are looking straight ahead an object that is behind you is in your cone of vision.
a. True
b. False
Answer:
b. False
Explanation:
An object that is behind you, is not in your cone of vision, since your cone of vision, is an imaginary cone that projects from your eyes foward, approximate 60-degree angle straight foward. The cone of vision is the area of sight.
As you can not see behind you, an object behind you, is not in your cone of vision.
How far does light travel in the time it takes sound to travel 1 cm in air at 20°c?
Final answer:
The distance light travels in the time it takes sound to travel 1 cm in air at 20°C is approximately 8.75 × 10^5 cm.
Explanation:
The speed of sound in air can be approximated using the formula v = 331.4 m/s + 0.6T, where T is the temperature of the air in Celsius. At 20°C, the speed of sound is approximately 343 m/s. To find the distance light travels in the time it takes sound to travel 1 cm in air at 20°C, we can set up a proportion.
If sound travels 1 cm in air at a speed of 343 m/s, we can set up the following proportion:
343 m/s / 1 cm = c / x
where c is the speed of light and x is the distance light travels in the same time. Solving for x, we find:
x = (1 cm) * (c / 343 m/s)
Substituting the speed of light c = 3.0 × 10^8 m/s, we can calculate the distance light travels:
x = (1 cm) * (3.0 × 10^8 m/s / 343 m/s)
x ≈ 8.75 × 10^5 cm
What is the correct current value if the selector is in the 0.5 dcma position?
The correct current value is 1.35 A.
Explanation:The correct current value in the 0.5 dcma position can be determined using the given information. According to the information provided in the question, after 5.00 ms, the current declines to 0.368 of the initial value at t=0. Therefore, we can find the initial value of the current by dividing the value at t=5.00 ms by 0.368. Let's calculate:
Initial current = (0.368)(3.68 A) = 1.35 A
So, the correct current value if the selector is in the 0.5 dcma position is 1.35 A.
The car below emits sound waves, represented by red circles, that are heard by an observer. based on the pattern of sound waves, what is the direction and speed of the car?
Answer: Away from the observer, faster than the speed of sound.
Based on the pattern of sound waves, the direction of the car is away from the observer for the wave fronts have spaced out and the speed of the car is faster than the sound. This happen because a lower frequency of wave peaks is observe as the source of the sound travels away from the observer.
Answer:
The answer is C
Explanation:
The motor of a crane uses power p to lift a steel beam. by what factor must the motor's power increase to lift the beam twice as high in half the time?
The power factor required to lift the beam twice as high in half the original time is : 4
Given that :
Power ( P ) = Work done / time -- ( 1 )
Also work done for a lifted load
Work done = mgh ( mass * gravity * height )
Back to equation ( 1 )
Power ( p ) = mgh / time --- ( 2 )
Considering the conditions given
When; h = 2 * h and t = 1/2 * t
Power becomes
New Power = m*g*2h / 1/2* t
= 4( m*g*h / 2
Therefore we can conclude that The power factor required to lift the beam twice as high in half the original time is : 4.
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When the north pole of a bar magnet is moved into a solenoid, the needle on a galvanometer attached to the solenoid moves to the left, indicating that a current is produced. the magnet is then pulled out at a faster speed.what will be the result?a larger current in the same directiona larger current in the opposite directiona smaller current in the same directiona smaller current in the opposite direction?
answer BBBBBBBBBBBB on EDGE
Answer:
a larger current in the opposite direction
Explanation:
As we know by Faraday's law of electromagnetic induction that rate of change in magnetic flux will induce electric current in a conducting coil linked with it
so it is given as
[tex]EMF = \frac{d\phi}{dt}[/tex]
now in this situation we know that first a magnet is entering into the coil so here the magnetic flux is increasing linked with the solenoid coil.
So it will induce some current in the coil which shows deflection in galvanometer coil.
Now when we pull the magnet out then it will decrease the flux linked with the coil so here the direction of induced current must have to decrease.
Also it is given that coil is removed at faster rate due to which the rate of change in flux will be more so here it will induce more current
so correct answer would be
a larger current in the opposite direction
How does the elbow medical and lateral epicondylitis?
In what ways are Terrestrial planets different from Jovian planets?
How does Coulomb's Law and electric charge cause your hair to stand on edge when it is really dry outside and you walk across the carpet?
When 108 grams of water at a temperature of 22.5c is mixed with 65.1 grams of water at an unknown temperature, the final temperature of the resulting mixture is 47.9c. what was the temperature of the other sample of water?
Final answer:
To determine the initial temperature of the 65.1 grams of water, the concept of heat transfer is applied, utilizing the formula q = mcΔT and setting the heat lost by the 108g water equal to the heat gained by the 65.1g water.
Explanation:
To find the initial temperature of the 65.1 grams of water before mixing, we can use the concept of heat transfer and the principle that the total heat lost by the warmer substance is equal to the total heat gained by the cooler substance. The formula for calculating heat (q) is q = mcΔT, where m is the mass in grams, c is the specific heat capacity (for water, c = 4.18 J/g°C), and ΔT is the change in temperature.
For the 108 grams of water cooling down: q = (108g)(4.18 J/g°C)(47.9°C - 22.5°C).
For the 65.1 grams of water heating up: q = (65.1g)(4.18 J/g°C)(47.9°C - T), where T is the initial temperature of the 65.1g water sample.
By setting the heat lost by the 108g water equal to the heat gained by the 65.1g water and solving for T, the initial temperature of the 65.1 grams of water can be determined.
After calculations, the initial temperature of the unknown sample of water is determined to be 90.01°C.
To find the unknown temperature of the 65.1 grams of water, we need to apply the principle of conservation of energy. The heat gained by the 108 grams of water at 22.5°C must equal the heat lost by the 65.1 grams of water at the unknown temperature.
Using the formula for heat transfer:
Q = mcΔT,
where:
Q is the heat absorbed or released,m is the mass,c is the specific heat capacity (for water, c = 4.18 J/g°C), andΔT is the change in temperature.Step-by-Step Calculation:
Calculate the heat gained by the 108 g of water:
Q_gained = (108 g) * (4.18 J/g°C) * (47.9°C - 22.5°C).
Q_gained = 108 g * 4.18 J/g°C * 25.4°C = 11472.912 J.
Let T be the initial temperature of the 65.1 g of water. Calculate the heat lost by this water:
Q_lost = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).
Since heat gained = heat lost, set Q_gained equal to Q_lost:
11472.912 J = (65.1 g) * (4.18 J/g°C) * (T - 47.9°C).
Solve for T:
11472.912 J = 272.418 J/°C * (T - 47.9°C).
11472.912 J / 272.418 J/°C = T - 47.9°C.
42.11°C = T - 47.9°C.
T = 42.11°C + 47.9°C.
T = 90.01°C.
Therefore, the temperature of the other sample of water was 90.01°C.
In the graph, a sample of water is heated from 40 degrees Celsius to 100 degrees Celsius. Which statement correctly describes the curve?
A) QR- liquid only
RS- phase change liquid-gas
ST- gas only
B) QR- liquid only
RS- phase change liquid-solid
ST- solid only
C) QR- solid only
RS- phase change solid-liquid
ST- liquid only
D) QR- phase change solid-liquid
RS- liquid only
ST- phase change liquid-gas
Answer:
The statement that correctly describes the curve is : ( A )
QR - liquid only RS - phase change liquid-gasST - gas only Phase changeGiven that the temperature is at 40 degrees the water is at its liquid state while at the plateau stage ( RS ) the liquid water changes its state to gaseous. At curve ST when the temperature ≥ 100 degree the state of the sample of water becomes gas only.
Hence we can conclude that the statement that describes the curve is statement A
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What are the reactants and what is the product of Zn(s)+S(s)->ZnS(s)
In the reaction, Zn(s) + S(s) -> ZnS(s), Zinc (Zn) and Sulfur (S) are the reactants and Zinc Sulfide (ZnS) is the product. This type of reaction is known as a combination or synthesis reaction.
Explanation:In a chemical reaction, substances that interact are called reactants, and the newly formed substances are called products. In the reaction you have given, Zn(s) + S(s) -> ZnS(s), the reactants are zinc (Zn) and sulfur (S), and the product formed is zinc sulfide (ZnS). This type of reaction is a synthesis or combination reaction wherein two or more simple substances combine to form a more complex substance. It's important to note that in this reaction, Zn and S are in their elemental forms and the reaction represents the process of sulfide mineral formation.
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In the reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in solid form. The product is zinc sulfide (ZnS), also in solid form. This is a synthesis reaction where the elements combine to form a single compound.
Reactants and Product of Zn(s) + S(s) → ZnS(s)
In the chemical reaction Zn(s) + S(s) → ZnS(s), the reactants are zinc (Zn) and sulfur (S), both in their solid forms. The product of this reaction is zinc sulfide (ZnS), which is also in the solid state. Here is the step-by-step identification:
Reactants: Zinc (Zn) and Sulfur (S)
Product: Zinc Sulfide (ZnS)
This reaction is an example of a synthesis reaction, where two or more elements combine to form a single compound.
What must Lauren do to make her sugar cube dissolve quicker than Matt and Erin?
A cyclist rides her bike 7 mi east, and then 2 mi north before taking a break. Then she rides 5 mi east and then 3 mi north. What are the magnitude and direction of the cyclist’s resultant displacement?
magnitude: 13.0 mi; direction: 22.6° north of east
magnitude: 13.0 mi; direction: 67.4° north of east
magnitude: 10.9 mi; direction: 67.4° north of east
A block slides down a rough ramp with a 30-degree incline as shown.
The question involves a block sliding down a 30-degree incline, where the forces of gravity, normal force, and friction are in effect. The acceleration of the block can be determined by taking into account all the forces acting on it. This is a topic in Physics, typically studied at the high school level.
Explanation:In the described scenario, a block is sliding down a rough ramp inclined at 30 degrees. This topic falls under the area of Physics, specifically in the study of friction and forces. The forces at play in this situation are gravity, normal force, and frictional force. When a block slides down an inclined plane, the force of gravity is divided into two components. The component parallel to the ramp, mg sin θ, acts downwards and is opposed by the force of friction.
The frictional force is determined by multiplying the normal force by the coefficient of friction (μ). This could be represented as F = μN, where F is the frictional slide and N is the normal force. The block's acceleration depends on the net force acting on it, considering all the forces at play.
In this particular situation, where there's a known coefficient of friction of 0.20 and given gravitational and normal forces are 40 N, you can use these values, along with the angle of the ramp, to find the acceleration of the block using formulae from physics.
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A block sliding down a rough incline experiences forces from gravity, friction, and normal force. Friction opposes the motion, reducing the acceleration the block would have on a frictionless slope. The acceleration can be calculated from the incline angle and friction coefficient.
Explanation:The question deals with the physics of a block sliding down a rough, incline plane. When a block is sliding down an inclined plane, there are several forces at play. The gravitational force pulls the block downwards, the normal force counters this directly perpendicular to the slope, and friction acts to oppose the motion of the block. The coefficient of friction between the block and the incline plays a crucial role in the block's acceleration down the incline.
The acceleration of the block can be calculated using the formula a = g sin θ, where g is acceleration due to gravity and θ is the incline angle. However, this applies when there's negligible friction. If friction is involved, it reduces the acceleration from this value. The acceleration on an incline where there is friction can be calculated with the equation ax = g sin θ - μk g cos θ, where μk is the coefficient of kinetic friction.
Using the equation above, you can calculate acceleration if you are given the friction coefficient and the incline's angle. However, if you're given the acceleration and either the incline angle or friction coefficient, you can rearrange the equation to calculate the missing variable, helping you gain more understanding about the impacts of the slope and friction.
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How does modern technology use electromagnets?
There are various uses of electromagnets in modern technology.
The first and very recent use of electromagnet is magnetic levitation train. Here strong electromagnets are used by which the magnetic levitation of train and its propulsion become possible.
The second use of electromagnet is lifting heavy plates of magnetic metals from shore to the ship.
The electromagnets are also used in various kinds of electric devices like speakers,generators,motors and hard disk drivers etc. In electric bells,the electromagnetic coils are used which helps in striking the bell.
The electromagnets are also used in casa of cyclotron. In case of cyclotron,strong electromagnetic dees are present which plays a crucial role in accelerating the charged particle.
Find the wavelength of a wave traveling at 3.26 e6 m/s with a period of 0.0125 s.
Answer:
m=40.8km.
Explanation:
The frequency of a wave is the reciprocal of its period, so for the wave in this problem, its frequency isf= \frac{1}{T}= \frac{1}{0.0125 s} =80 Hzf=T
1
=
0.0125s1
=80Hz
The basic relationship bet
where
\lambdaλ is the wavelength of the wave
v is its speed
f is its frequency
If we plug the numbers given by the problem into this equation, we can find the wavelength of this wave:
\lambda= \frac{v}{f}= \frac{3.26 \cdot 10^6 m/s}{80 Hz}=4.08 \cdot 10^4 m=40.8 kmλ=
f v
=
80Hz
3.26⋅10
6
m/s
=4.08⋅10
4
m=40.8km
Equus caballus is the scientific name for a domestic horse. Equus zebra is the scientific name for a zebra. Which of the following statements is true?
1. The domestic horse belongs to the Equus order.
2. The domestic horse belongs to the caballus genus.
3. The zebra and domestic horse belong to the same species.
4. The zebra and domestic horse belong to the same genus.
Answer:
The zebra and domestic horse belong to the same genus.
Explanation:
Did on odyssey
in a solution of seawater water is the solute true or false??