Answer:
1. Generator
2. Direct current
Explanation:
1. The Generator is a device that uses energy of motion in a magnetic field to produce electric current. It converts mechanical energy into electrical energy.
2. The direct current or DC is the current in which charges flow in one direction. When there is continuous flow of electron tp the positive side from the negative side through a conducting material then the current is said to be Direct current.
A milliliter of very hot water is added to a liter of very cold water. Which of these events will occur? Assume the surrounding air is at room temperature.
a. The cold water will warm to room temperature.
b. The hot water will cool down.
c. The cold water will warm up.
d. The cold water will warm up, but will never reach room temperature.
Answer:b
Explanation:the water will not be hot nomore because of the cold water
During summer in the northern hemisphere _____.
the sun is closer to than during winter
the sun's rays do not hit as directly as during winter
the days are longer than during winter
Answer:
The days are longer than during winter
Explanation:
In the summer, days feel longer because the Sun rises earlier in the morning and sets later at night. When the North Pole of the Earth is tilted toward the Sun, we in the northern hemisphere receive more sunlight and it's summer. ... It is also the day that the Sun reaches its highest point in the sky.
when arti kicks a football two forces interact, arti's foot exerts a force of 5N on the ball. what size force will be exerted on arti's foot?
Answer:
5N
Explanation:
From Newton's third law, we understood that to every action, there is an equal an opposite reaction.
Since Arti's foot exerts a force of 5N on the ball, then, an equal and opposite force of 5N will be exerted on Arti's foot as understood from Newton's third law.
Therefore, a force of 5N will be exerted on Arti's foot.
Two forces interact when Arti kicks a football - Arti's foot exerts a 5N force on the ball, and the ball exerts a 5N force on Arti's foot.
Explanation:When Arti kicks a football, two forces interact - Arti's foot exerts a force of 5N on the ball.
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. So, the ball exerts a force of 5N on Arti's foot in the opposite direction. Therefore, the size of the force exerted on Arti's foot is also 5N.
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If a car is traveling at 15 mph and increases to a speed of 45 mph in 10 seconds, what is the acceleration? A. 30 mph B. 3 mph C. 3 mph/s D. 30 mph/s
The acceleration will be "3 mph/s".
According to the question,
Final velocity,
45 mphInitial velocity,
15 mphTime,
10 secAs we know the formula,
→ [tex]Acceleration =\frac{Final \ velocity-Initial \ velocity}{Time}[/tex]
By substituting the values, we get
→ [tex]= \frac{45-15}{10}[/tex]
→ [tex]= \frac{30}{10}[/tex]
→ [tex]= 3 \ mph/s[/tex]
Thus above answer is right.
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a proton is placed 100 micrometers from a helium nucleus. Gravity pulls the proton and nucleus together, while the electric force pushes them apart. Which is stronger, and by how much?
Answer:
The electric force is [tex]6.2\cdot 10^{35}[/tex] times stronger than the gravitational force
Explanation:
The magnitude of the electrostatic force between two charges is given by:
[tex]F_E=k\frac{q_1 q_2}{r^2}[/tex]
where:
[tex]k=8.99\cdot 10^9 Nm^{-2}C^{-2}[/tex] is the Coulomb's constant
[tex]q_1, q_2[/tex] are the two charges
r is the separation between the two charges
In this problem:
[tex]q_1=1.6\cdot 10^{-19}C[/tex] (charge of the proton)
[tex]q_2=3.2\cdot 10^{-19}C[/tex] (charge of a nucleus of helium, twice the charge of a proton)
[tex]r=100 \mu m = 100\cdot 10^{-6} m[/tex]
So the electric force is
[tex]F_E=(8.99\cdot 10^9)\frac{(1.6\cdot 10^{-19})(3.2\cdot 10^{-19})}{(100\cdot 10^{-6})^2}=4.6\cdot 10^{-20} N[/tex]
Instead, the magnitude of the gravitational force between two objects is given by :
[tex]F_G=G\frac{m_1 m_2}{r^2}[/tex]
where
[tex]G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}[/tex] is the gravitational constant
m1, m2 are the masses of the two objects
r is the separation between them
Here we have:
[tex]m_1=1.67\cdot 10^{-27}kg[/tex] is the mass of the proton
[tex]m_2=6.68\cdot 10^{-27}kg[/tex] is the mass of a nucleus of helium (4 times the mass of the proton)
[tex]r=100 \mu m = 100\cdot 10^{-6} m[/tex] is the separation
So the gravitational force is
[tex]F_G=(6.67\cdot 10^{-11})\frac{(1.67\cdot 10^{-27})(6.68\cdot 10^{-27})}{(100\cdot 10^{-6})^2}=7.4\cdot 10^{-56} N[/tex]
So, we see that the electric force is much stronger than the gravitational factor, by a factor of:
[tex]\frac{F_E}{F_G}=\frac{4.6\cdot 10^{-20}}{7.4\cdot 10^{-56}}=6.2\cdot 10^{35}[/tex]
Please Help me
An object is placed 20 cm away from a curved mirror that has a focal length of 7 cm.
Where is the image located? Is the image magnified or shrunken? Show your work
An image is produced 51.5 cm away from a converging lens. If the object is placed at 32 cm away, where is the focal point located? Show your work
If you used a converging lens with a focal length of 17 cm, where would you put an object that has a height of 5.5 cm to create a virtual image with a height of 13.8 cm? The image is located 22 cm away from the mirror. Show your work
Describe virtual images and how the simulation showed why they are virtual
1) 10.8 cm, shrunken
2) 19.7 cm
3) 8.8 cm
4) See explanation
Explanation:
1)
A mirror works on the principle of reflection: a ray of light coming from an object is reflected back by the mirror, producing an image of the object.
The position of the image can be found by using the mirror equation:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where
f is the focal length of the mirror
p is the position of the object
q is the location of the image
In this problem:
f = 7 cm is the focal length of the mirror
p = 20 cm is the position of the object
So we can find q from the equation:
[tex]\frac{1}{q}=\frac{1}{f}-\frac{1}{p}=\frac{1}{7}-\frac{1}{20}=0.0929\\q=\frac{1}{0.0929}=10.8 cm[/tex]
The sign of q is positive: this means the image is real.
The magnification of the image is given by
[tex]M=\frac{y'}{y}=-\frac{q}{p}[/tex]
where
y' is the size of the image
y is the size of the object
M is the magnification
Substituting,
[tex]M=-\frac{10.8}{20}=-0.54[/tex]
Which means that he image is shrunken, (because [tex]|M|<1[/tex]), so [tex]y'<y[/tex].
2)
A lens works on the principle of refraction: the rays of light coming from an object are refracted into the focal point of the lens, and they can produce an image of the object.
We can solve the problem by using the lens equation:
[tex]\frac{1}{f}=\frac{1}{p}+\frac{1}{q}[/tex]
where
f is the focal length of the length
p is the position of the object
q is the location of the image
In this problem we have:
q = 51.5 cm is the location of the image
p = 32 cm is the position of the object
Solving for f, we find the focal length:
[tex]\frac{1}{f}=\frac{1}{32}+\frac{1}{51.5}=0.051\\f=\frac{1}{0.051}=19.7 cm[/tex]
3)
In this problem, we know the following data:
[tex]f=+17 cm[/tex] is the focal length (for a converging lens, it is positive)
[tex]y=5.5 cm[/tex] is the height of the object
[tex]y'=13.8 cm[/tex] is the height of the image
[tex]q=-22 cm[/tex] is the location of the image (it is negative because the image is virtual)
From the magnification equation, we can find the position of the object:
[tex]\frac{y'}{y}=-\frac{q}{p}[/tex]
And solving for p, the position of the object, we find:
[tex]p=-\frac{qy}{y'}=-\frac{(-22)(5.5)}{13.8}=8.8 cm[/tex]
So, the object should be located 8.8 cm from the lens.
4)
The images produced by a lens or by a mirror can be of two types:
Real: a real image is produced when the refracted (or reflected) rays actually meet behind the lens (or in front of the mirror). In this case, the image can be actually projected on a screen. A real image is located behind the lens (or in front of the mirror).Virtual: a virtual image is produced when the refracted (or reflected) rays do not meet at any point, so no image can be actually projected on a screen. In this case, the image forms from the intersection of the prolongation of the refracted/reflected rays. A virtual image is located in front of the lens (or behind the mirror).Fast please. What is the main source of the sun's energy?
Answer:
radiation
Explanation:
if there was no radiation there would be an iceage
why was the geocentric model of the solar system accepted by scientist for many years?
The geocentric model of the solar system was accepted because it made sense based on observations at the time. The heliocentric model became accepted later thanks to the work of Copernicus and Galileo.
Explanation:The geocentric model of the solar system was accepted by scientists for many years because it appeared to make sense based on the observations at the time. In the geocentric model, Earth was believed to be at the center of the universe, with the planets and the Sun orbiting around it. This model was supported by the apparent motion of the celestial bodies in the sky.
For centuries, people observed that the Sun appeared to rise in the east and set in the west, while the planets seemed to move across the sky in different paths. The geocentric model provided a simple explanation for these observations. Additionally, there was a lack of evidence at the time to support an alternative model.
It was not until the 16th century, with the work of Nicolaus Copernicus and later Galileo Galilei, that the heliocentric model of the solar system started gaining acceptance. The heliocentric model, with the Sun at the center, provided a more accurate explanation for the motion of the planets, as well as other astronomical phenomena. The development of telescopes and advancements in observations also contributed to the acceptance of the heliocentric model.
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The geocentric model was accepted for years due to its ability to predict planetary motions and its alignment with religious and philosophical beliefs.
The geocentric model, which positioned Earth at the center of the universe, was accepted by scientists and scholars for many years due to a combination of observational, philosophical, and religious reasons.
Even when Greek astronomers suggested that it was more natural for smaller objects to revolve around larger ones, the Ptolemaic model persisted because it was able to predict planetary motion with reasonable accuracy through complex mechanisms like epicycles and deferents.
The geocentric model was further reinforced by the fact that it was embedded in the teachings of the Church, and the heliocentric idea faced significant resistance due to the societal and theological implications of displacing Earth from the cosmic center.
It was not until the works of astronomers such as Copernicus, Brahe, Kepler, and Galileo provided substantial evidence that the heliocentric model began to gain acceptance over the geocentric model.
GUYS HELP ITS DUE 20 MIN PLEASEEEEE. I SHOULD HAVE ASKED EARLIERRRRRR
How does the force of gravity between two bodies change when the distance between them is increased by a factor of 5? Express your answer using two significant figures.
Ffinal/Finitial=
Mass wasting is the rapid down-slope movement of rock and soil from a mountain or steep hill. If massive amounts of rock and soil land in a body of water, a tsunami can be the result.
Which of the following measures could help to reduce the negative effects of catastrophic mass-wasting events?
Answer:
do
Explanation:
Answer: All major slopes at risk of mass wasting could be identified and monitored.
Is a hammer a rigid body
Answer:
See the explanation below.
Explanation:
A rigid body is an ideal concept of a body that does not vary its shape or dimensions when subjected by external forces. In real life all bodies are deformed independent of the hardness or strength of the material, whether in very small values of millimeter. The hammer in this case is considered as a rigid body for practical cases of kinematics or Kinetics in physics and engineering studies.
Electric field lines:
A. always surround a neutron.
B. are visible to the human eye.
C. are bent when two charges interact.
D. always exert attractive forces.
Answer:
A
Explanation:
Answer:
C. are bent when two charges interact.
Explanation:
took the quiz on A p e x
Which of the following is an example of diffraction
A. Hearing a person around a corner before you can see them
B. Seeing a person around a corner before you can hear them
C. A straw in a glass of water appearing "broken"
D. Yelling out in a cave and hearing your voice call back to you
Answer:
the answer would be D. Yelling out in a cave and hearing your voice call back to you
Explanation:
A 210Ω resistor is connected in a circuit with a 110V battery. What total amount of charge passes through a point in the circuit in 2 minutes?
Answer: 62.86 coulombs
Explanation:
Resistance (R) = 210Ω
Voltage of battery (V) = 110V
total amount of charge (Q) = ?
Time (T) = 2 minutes
The SI unit of time is seconds so convert 2 minutes to seconds
(If 1 minute = 60 seconds
2 minutes = 2 x 60 = 120 seconds)
To get the total charge, first get the current (I) flowing in the circuit by applying the formula V = IR
110V = I x 210Ω
I = 110V/210Ω
I = 0.524 Amps
Then, apply the formula
Charge = current x time
i.e Q = IT
Q = 0.524 Amps x 120 seconds
Q = 62.86 coulombs
Thus, 62.86 coulombs of charge passes through the circuit.
Final answer:
To calculate the total amount of charge that passes through a point in the circuit in 2 minutes, we first find the current using Ohm's Law and then multiply by the time in seconds. The result is a total charge of 62.856 coulombs.
Explanation:
Calculating Total Charge in a Circuit
To find the total amount of charge that passes through a point in a circuit, we need to calculate the current first and then use the relationship between charge, current, and time. According to Ohm's Law, the current I in a circuit is given by the voltage V across the resistor divided by the resistance R of the resistor. In this case, with a 110V battery and a 210Ω resistor, the current is I = V/R = 110V/210Ω. Once we have the current, we can calculate the charge Q that passes through a point by multiplying the current by the time in seconds.
First, calculate the current: I = 110V / 210Ω ≈ 0.5238 A.
Next, convert the time given in the question from minutes to seconds: 2 minutes is 2 x 60 = 120 seconds.
Finally, multiply the current by the time to find the total charge: Q = I x time = 0.5238 A x 120 s = 62.856 C.
Therefore, the total amount of charge that passes through a point in the circuit in 2 minutes is 62.856 coulombs.
50 POINTS HELP ME PLEASE!!!!!!!!!!!!
Which arrows represent the way a person should go to escape the rip current?
W and X
X and Y
Y and Z
Z and W
Answer:
W and X
Explanation:
When escaping a rip current, one should always walk to the side until you escape from the rip current. If you walk towards the shore, you have the ability to keep getting dragged toward the current, such as with X and Y.
Answer:A
Explanation:
which environmental change occurs quickly
Charges
The glass is attracting the pieces of paper. What does
this tell you about the charges on the glass and the
paper
The glass and the paper have the same charge.
The glass and the paper have different charges
Neither the glass nor the paper has a charge
Answer:
B.) The glass and paper have different charges
Explanation:
Answer:
The glass and paper have different charges
Explanation:
did the instruction on edge
What is the relationship between an object’s mass and its ability to pick
up speed, or accelerate?
Answer:
Force = m a
Explanation:
Force is the quantity that relates mass of an object with its accelerate.
Final answer:
The acceleration of an object is directly proportional to the force applied and inversely proportional to its mass, as described by Newton's second law of motion (F = ma). Therefore, a less massive object will accelerate more than a more massive one when subjected to the same force.
Explanation:
The relationship between an object's mass and its ability to accelerate is a fundamental concept in Physics. According to Newton's second law, the acceleration (a) of an object is directly proportional to the net force (F) applied to it and inversely proportional to its mass (m), which can be expressed with the formula F = ma. This means for the same applied force, an object with less mass will accelerate more than an object with greater mass. As mass increases, more force is required to achieve the same acceleration.
Experiencing Mass and Acceleration
Our daily experience supports this relationship. Pushing a bicycle, which has less mass, results in more readily noticeable acceleration compared to pushing a car, which has more mass. The force necessary to change the motion of the car is significantly higher due to its greater mass.
Certain conditions must be met when applying Newton's second law. The object's velocity should be well below the speed of light, the force must be the total force accounting for all significant factors, and the observation must be made in an inertial reference frame. Within these parameters, we can accurately predict the impact of mass on an object's acceleration in response to a given force.
Calculate the kinetic energy of a truck that has a mass of 2900 kg and is moving
at 55 m/s.
Answer:
4386250J
Explanation:
In the picture above.
Hope this helps.
Final answer:
The kinetic energy of a truck with a mass of 2900 kg moving at 55 m/s is calculated using the formula KE = ½ mv², resulting in 4,386,250 joules (J).
Explanation:
To calculate the kinetic energy (KE) of a truck with a mass of 2900 kg moving at 55 m/s, we use the formula:
KE = ½ mv²
Where:
m is the mass of the object,v is the velocity of the object.By plugging in the values:
KE = ½ (2900 kg) (55 m/s)²
KE = ½ (2900) (3025)
KE = 0.5 × 2900 kg × 3025 m²/s²
KE = 4,386,250 J
The kinetic energy of the truck is 4,386,250 joules (J).
how many electrons will constitute 2A current in unit time
Answer:
2 charges of electron (2C)
Explanation:
I = Q/t
2 = Q/1
Q = 2×1= 2C
Q = 2 charge of electron
A motorcycle is traveling with a velocity of 4 m/s and has a mass of 112 kg
Answer: 896J
Explanation:
Given that
Mass of motorcycle = 112kg
kinetic energy = ?
velocity of the motorcycle = 4m/s
Since kinetic energy is the energy possessed by a moving object, and it depends on the mass (m) of the object and the velocity (v) by which it moves. Therefore, the motorcycle has kinetic energy
i.e K.E = 1/2mv^2
KE = 1/2 x 112kg x (4m/s)^2
KE = 0.5 x 112 x 16
KE = 896J
Thus, the motorcycle has 896 joules of kinetic energy.
9. If a force of 10 N is applied to an object with a mass of 1 kg, what would be the
acceleration?
Explanation:
We know that F = ma
So given
Force (F) = 10N
Mass (m) = 1kg
Acceleration (a) = ?
We know
F = ma
10 = 1 * a
Therefore Acceleration = 10 m/s²
Answer:
10m/s2
Explanation:
Force = mass x acceleration
10 = 1 x a
Divide both sides by 1
10/1 = 1/1 x a
10 = a
a = 10m/s2
he graph shows a marble rolling down a curve from position 1 to position 5. In which position is the potential energy of the marble greatest?
Should be position 1.
In which part of the wave are the particles of the medium closer together?
rarefactions
compressions
solids
liquids
Answer:
compressions
Explanation:
compressions part of the wave are the particles of the medium closer together. Hence option B is correct.
What is wave ?Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.
Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform. There are two types of the wave longitudinal wave and transverse wave.
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What is the equivalent resistance in this parallel circuit?
What is the voltage in the circuit?
What is the total current in the circuit?
120 V
5.003 10.093 15.003
Answer:
Equivalent resistance: 2.73 Ω
Voltage: 120 V
Total current: 44 A
Explanation:
In the figure attached, the circuit is shown
The equivalent resistance (Rt) is calculated as follows:
1/Rt = 1/R1 + 1/R2 + 1/R3
where R1, R2 and R3 are the individual resistances. Replacing with R1 = 5 Ω, R2 = 10 Ω and R3 = 15 Ω, we get:
1/Rt = 1/5 + 1/10 + 1/15
1/Rt = 5.5/15
Rt = 15/5.5 = 2.73 Ω
From the picture, the voltage in the circuit is 120V
From Ohm's law:
It = V/Rt
where It is the total current, V is the voltage and Rt is the equivalent resistance
It = 120*5.5/15 = 44 A
Answer:
Equivalent resistance: 2.7
Explanation:
trust me
A circuit contains four light bulbs. One light bulb goes out but the other three stays it. This must be an)
circuit
A parallel
B Closed
C series
D open
Answer:
It is a parallel connection
Explanation:
In parallel connection the
Cell is not easily used up because the cells share the total current generated together with all bulbs.
But a major problem is the bulbs must not be left together undisconnected to avoid exhaustion arising from short fall in the strength of one cell as this bounds to affect others
Answer:
parallel
Explanation:
Which situation can strengthen a community's stability?
O
A. Loss of a keystone species
O
B. Interdependence among species
O
c. Removal of a top predator species
O
D. Competition among species for food
Answer:
B
Explanation:
If a polar bear runs at a speed of about 8.3 m/s, how far will it travel in 10.0 hours
Answer: 298800 metres
Explanation:
Given that:
speed of polar bear = 8.3 m/s
Distance traveled = ?
Time taken = 10.0 hours
Since the SI unit of time is seconds, convert time in hours to seconds
1 hour = 60 minutes & 1 minute = 60 sec
So, 10.0 hours = (10 x 60 x 60)
= 36000 seconds
Apply the formula:
speed = distance traveled / time taken
8.3 m/s = distance traveled / 36000 seconds
Distance traveled = 8.3m/s x 36000 sec
= 298800 metres
Thus, the polar bear traveled 298800 metres.
PLEASE ANSWER ASAP!!!!!!!
The picture below shows a toy car in the process of rolling down a ramp. At point X, the kinetic energy is 50 Joules (J), and the potential energy is 30 J.
What is the total energy in the system once the car reaches the bottom of the ramp?
A
20 J, because the energy in the system cannot change form but can be created and destroyed
B
80 J, because the energy in the system can change form but cannot be created or destroyed
C
30 J, because the potential energy is the only energy at the bottom of the ramp
D
50 J, because the kinetic energy is the only energy at the bottom of the ramp
Answer:
B. Mechanical energy= 50J+30J=80J
Answer:
80J
Explanation:
Which of the following statements describes a battery?
Batteries store electric charge.
Batteries use electrolytes and similar metals to produce a flow of electrons.
The negative electrode of a battery has an excess of positive charge.
Batteries convert chemical potential energy into electric energy.
Answer:
Batteries use electrolytes and similar metals to produce a flow of electrons.
Answer:
D. Batteries convert chemical potential energy into electric energy
Explanation:
It was the correct answer on OW