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A roller coaster car starts stationary at the top of a downwards slope. At the bottom of the slope, it has a speed of 30m/s. Use the conservation of energy to find the vertical height of the slope. (Use g=10 m/s^2)

From the conservation of energy, we know that the change in gravitational potential energy (GPE) is equal to the change in kinetic energy (KE). GPE=mgh and KE=(1/2)mv^2. At the top of the slope, the car star...
TM
Answered by Tamsin M. • Physics tutor
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A coil is connected to a voltmeter. A bar magnet, initially held above the coil, is left to fall into the coil. Explain why the voltmeter shows a reading. How will the reading of the voltmeter be affected if the magnet is dropped from a greater height?

As the bar magnet enters and exits the coil, there is a change in magnetic flux linkage through the coil. According to Faraday's law, an EMF is induced across the coil that is proportional to the rate of cha...
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Answered by Andrea A. • Physics tutor
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Why do you weigh less on the Moon than on Earth?

Weight is the product of an object's mass and the dominant gravitational field that it feels. On Earth, objects feel a gravitational acceleration which is dependent on the mass of the earth and its rotationa...
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Answered by Nicky M. • Physics tutor
15037 Views

describe the process of nuclear fission

a neutron is absorbed by a big nucleusthe nucleus then splits into 2 smaller nucleithis releases energy and more neutrons
AP
Answered by Abigail P. • Physics tutor
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Explain why the stability of a car can be improved by widening the wheel base and lowering the centre of gravity.

A car will topple over when it is tilted so far that the line of action from the centre of gravity falls outside of the wheel base, causing a resultant moment around the side being tilted. Extending the base...
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Answered by Tim H. • Physics tutor
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