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What do geostationary satellites do?

Geostationary satellites are objects (usually machines) that orbit the Earth at exactly the same velocity as the rotation of the Earth (strictly, the orbital period of the satellite is equal to the rotationa...
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Answered by Bill A. • Physics tutor
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How did rutherford's gold leaf experiment prove the existence of the nucleus?

Firstly the gold foil was flattened so that it was one atom thick. The researchers knew that alpha particles were positively charged, and so would be repelled by other positive charges. At the atomic scale t...
LH
Answered by Lucas H. • Physics tutor
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A block of mass m is released from rest on a surface inclined at 30⁰ to the horizontal with a coefficient of friction of 0.3. How long does it take for the block to slide 1 m?

Firstly, a free-body diagram of the problem should be drawn indicating the forces acting on the block (remember that the friction force is the product of the normal reaction on the block and the coefficient ...
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Answered by Richard P. • Physics tutor
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A train is travelling at 50m/s. How long does it take the train to reach 60m/s if it accelerates at a constant rate of 0.5m/s^2? How many kilometres does it travel in this time?

The initial velocity, u, is 50 ms -1 The final velocity, v, is 60 ms -1 The acceleration, a, is 0.5ms -2 The question is asking us to find the time, t. The equation of motion linking u, v, a, and t is v = u ...
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Answered by Elena S. • Physics tutor
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What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses.

specific heat capacity of water, c = 4200J/kgK First student should understand that due to no heat losses the energy provided by mains socket to kettle is the same energy as the heat which changes the water ...
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Answered by Will S. • Physics tutor
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