Answer:
C is correct
Explanation:
When a current flows through a light bulb, it emits 30 J light energy in 2 seconds, What is the power of the bulb?
The power of the light bulb is 15 watts.
What is power ?Power in physics is defined as the rate of energy per unit time or in other words the work done by any electrical appliance per unit time. Power is expressed as -
P = E/T where E is Energy and T is the time period.
How to calculate the value of power in the question ?Given that the light bulb emits 30 J light energy in 2 seconds.
We have E = 30J and T = 2 seconds.
Therefore power(P) = Energy(E) / Time(T)
∴ P = 30 / 2 = 15 watts
Thus the power of the light bulb is 15 watts.
To learn more about power in physics, refer -
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A negative test charge experiences a force to the right as a result of an electric field. Which is the best conclusion to draw
based on this description?
The electric field points to the left because the force on a negative charge is opposite to the direction of the field,
The electric field points to the right because the force on a negative charge is in the same direction as the field,
No conclusion can be drawn because the sign of the charge creating the field is unknown,
No conclusion can be drawn because the amount of charge on the test charge is unknown.
Answer:a
Explanation:
Answer: ( A )
Explanation: the answer is a
As SCUBA divers go deeper underwater, the pressure from the weight of all the water above them increases tremendously which compresses the gases in their blood. What happens to the volume of gas in their blood as the diver rises quickly to the surface?
A.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to decrease.
B.
As a diver rises, the pressure on their body increases which allows the volume of the gas to decrease.
C.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to increase.
D.
As a diver rises, the pressure on their body increases which allows the volume of the gas to increase.
Answer: A.
As a diver rises, the pressure on their body decreases which allows the volume of the gas to decrease.
Explanation:
The problem is that a diver, experiences an increased pressure of water compresses nitrogen and more of it dissolves into the body. Just as there is a natural nitrogen saturation point at the surface, there are saturation points under water. Those depend on the depth, the type of body tissue involved, and also how long a diver is exposed to the extra pressure. The deeper a diver go, the more nitrogen the body absorbs.
The problem is getting rid of the nitrogen once you ascend again. As the pressure diminishes, nitrogen starts dissolving out of the tissues of the diver's body, a process called "off-gassing." That results in tiny nitrogen bubbles that then get carried to the lungs and breathed out. However, if there is too much nitrogen and/or it is released too quickly, small bubbles can combine to form larger bubbles, and those can do damage to the body, anything from minor discomforts all the way to major problems and even death.
A wave that is traveling toward an interface is called the...??
Answer:
Surface wave
Eg ocean wave
Please have a look at the image
Answer:
a
Explanation:
a. zero is the answer...
How much net force is needed to accelerate a 3 kilogram skateboard at 5 m/s2 this last on is a exponent use this formula net force = mass x acceleration Will MARK BRAINLLIEST
Answer:
15 N
Explanation:
Which of the following is a homogenous mixture?
Answer:
Blood
Explanation:
Homogenous means the same type and a box with toys, spaghetti and meatballs, and trail mix all have variety.
Answer:
B is the correct answer
Answer fast, please.
Plz help! Will give brainiest!
For the girl to lift this rock, she must push her end down _____ to raise the rock _____.
A. a lot; a little
B. a little; a lot
C. a little; a little
Answer:
A is the correct answer
Explanation:
mark brainliest please
What can happen if the excretory system doesn't work properly ?
Which are descriptions of gravity on Earth? Check all that apply.
an attractive force
a repulsive force
a noncontact force
a contact force
a horizontal force
a vertical force
Answer:
an attractive force
a noncontact force
a vertical force
Explanation:
Gravitational force is a NON-CONTACT FORCE. Gravitational force acts on all bodies on the earth that have mass. The force which is exerted through weight acts on the center of gravity of the body. The force is directed towards the center of the earth. The weight of a body is the gravitational force exerted by the earth on the body.
A,C,F.
Explanation: Got it correct.
the magnification priduced by a spherical mirror is +1/4.what type of image is formed?
Explanation:
As the magnification is positive , thus the image formed is inverted and real
A Physics question regarding circuits and electricity.
Which electromagnetic radiation can be seen with the human eye?
ultraviolet rays and visible light
infrared rays, visible light, and ultraviolet rays
visible light
visible light and X-rays
Answer:
Visible light
Explanation:
Answer:
C visible light
Explanation:
Dinesh wants to launch a package over the garden wall to his friend on the other side. His plan is to set up a see-saw, put the package on one end and jump on the other end. Dinesh determines that he will land on the board with a force of 1,127 newtons, and the package weighs 322 newtons. The board he is going to use for the see-saw is 9 meters long. How close to the end of the board should Dinesh put the fulcrum?
Answer:
Dinesh should put the fulcrum 2 m from himself and 7 m from the package.
Explanation:
Let the fulcrum be x meters from Dinesh's end.
The sum of clockwise moment must balance the sum of anti-clockwise moment.
Taking a moment about the fulcrum
(Force exerted by Dinesh) × (Distance of Dinesh from the fulcrum) = (Weight of the package) × (Distance of the package from the fulcrum)
Force exerted by Dinesh = 1127 N
Distance of Dinesh from the fulcrum = x m
Weight of the package = 322 N
Distance of the package from the fulcrum = (9 - x) m
1127 × x = 322 (9 - x)
1127x = 2,898 - 322x
1127x + 322x = 2,898
1449x = 2898
x = (2898/1449) = 2 m
Hence, Dinesh should put the fulcrum 2 m from himself and 7 m from the package.
Hope this Helps!!!
At what point in a waterfall, do the drops of water contain the most gravitational potential energy?
Answer:
The water above receives energy as it falls down the short waterfall. This energy was stored as potential energy in the gravitational field of the Earth and came out of storage as the water dropped. This energy which came out of the gravitational field ended up being expressed as the kinetic energy of the water. That is, the water gains kinetic energy as it drops. An ounce of water is going faster when it hits the bottom of the waterfall than it was when it went over the top of the waterfall
Explanation:
The drops of water contain the most gravitational potential energy at the top before they start falling.
At the top of the waterfall
GravitationAt the top of the waterfall, the water drops have the most gravitational potential energy before they start falling as the water at the peak of the waterfall is higher in the Earth's gravitational field and has gravitational potential energy. The potential energy is converted to kinetic energy when it falls. As a result, energy is not created; it was always there, stored as potential energy.
Potential energy is energy that is stored and is determined by the relative positions of various pieces of a system. Kinetic energy is the energy that an item or particle has as a result of its movement.
Find out more information about energy here:
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A lever used to lift a 200 N object 3 meters off the ground, is doing how many Joules of work?
Answer:
6000J
Explanation:
T=m.g.h
T=200.(10).(3)
T=2000.(3)=6000J
The distance from the maximum disturbance to the undisturbed position is the____ of a wave
Answer:
The amplitude of a wave is its maximum disturbance from its undisturbed position
Based on the law of conservation of energy hiw can we reasonably improve a machines ability to do work
Somebody can tell me what answers it is?
Answer:
D
Explanation:
The color you see is the color the object reflectes. The rest of the color are absorbed by that object.
How long will it take for 64 g of a radioactive material to be reduced to 2.0 g if the half-life is 0.5 hours?
Answer:
2.5 hours is the answer according to me
What do snow melting, water freezing to ice, and water boiling into steam have in
common? *
O
They involve a change in state.
They involve a change in temperature.
O
They involve a change in thermal energy.
All of the above are true.
Answer:
All of the above.
Explanation:
What is the current when a 200Ω appliance is plugged in to the wall?
Answer:1.1 A
Explanation:
Given
Resistance of appliance [tex]R=200\ \Omega[/tex]
We know common house hold voltage in India is [tex]220\ V[/tex]
and according to ohm's law
[tex]V=IR[/tex]
So, current
[tex]I=\frac{220}{200}[/tex]
[tex]I=1.1\ A[/tex]
What is the velocity of a wave that has a frequency of 400 Hz and a wavelength of 0.5 meters?
Answer:
4.2
Explanation:
Static electricity is an excess of neutrons.
A True
B. False
Answer: Static electricity is an excess of neutrons-FALSE
Explanation:
A P E X
At t = 0, a car has a speed of 30.0 m/s. At t=6.00 s, its velocity is 12.0 m/s.
What is its average acceleration during this interval? plz help...
Answer: [tex]-3m/s[/tex]
Explanation:
[tex]a=\frac{V_2-V_1}{t}[/tex]
[tex]a=\frac{12-30m}{6s}\\a=-\frac{18m}{6s}\\ a=-3m/s[/tex]
We have a negative acceleration, meaning that the car is slowing down.
Please help! I'll mark you as branliest!!! :)
Answer:
pretty sure its C, Radiation because the sun produces radiation
Explanation:
Answer: conduction
Explanation:
The sand is directly transferring heat to the people. They are touching, so it would be an example of conduction.
A flowerpot that has a mass of 1.5 kg is sitting on a windowsill 30 meters from the ground. Is the energy of the flowerpot potential of kinetic?
How much energy does the flowerpot have?
Answer:
It is Potential and corresponding to
90
J
.
Explanation:
Potential Energy is energy stored in the system and ready (potentially) to be changed into, say, Kinetic Energy through movement.
The general expression for Gravitational Potential Energy is:
U=mgh
where:
mg is the weight; h is the height relative to a certain reference level (the ground in this case) choosen to have zero Potential Energy.
With your data we get:
U=3⋅30=90J
A flowerpot that has a mass of 1.5 kg is sitting on a windowsill 30 meters from the ground. Is the energy of the flowerpot potential of kinetic?
How much energy does the flowerpot have?
Answer:
Potential energy
441 joules
Explanation:
The flower pot is not moving so it does not have kinetic energy. Anything that is still and a distance from the ground does have potential energy.
Amount of energy: p=mggh
p=1.5(9.8)(30)=441 joules
The flower pot's energy is measured in potential energy since it is remaining stationary and the energy is stored, the flowerpot is not moving about so it is not kinetic energy.
The formula for potential energy is:
GPE = mgh
The m stands more mass, the g stands for gravitational energy (9.8m/s^2) and the h stands for height.
Our values for the following terms are:
M = 1.5kg
G = 9.8m/s^2
H = 30 meters
Now, we can plug it into our formula to solve for the amount of potential energy.
GPE = 1.5(9.8)(30)
First, let's multiply the gravitational energy and the height.
30 x 9.8 = 294
Then, multiply the mass by the result.
1.5 x 294 = 441
Therefore, the potential energy of the flowerpot is 441J.
Which is a true statement?
A.
Valence electrons play a key role in chemical reactions.
B.
The properties of elements in a group are identical.
C.
Hydrogen contains multiple valence electrons.
Answer:
C
Explanation:
