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As a variable resistor's resistance can be changed, we can therefore change the current in the circuit. This will be according to Ohms Law, as a simple resistor is a Ohmic Conductor.

So if we set u...

It does no work because there its displacement from the center of its circular trajectory remains constant throughout the entirety of its motion. Therefore, by definition, the work done, i.e. distance tra...

We define gravitational potential as: the work done to bring a small "test" mass from infinity to a point. But what does this truly mean?

1. The "work done" is simply the...

First, draw a diagram as it makes the problem easier to understand. Show the turntable and mass. Label the distance between the mass and the centre of the turntable r as it is a radius. write down all var...

Energy = force x distance and Energy = 0.5 x mass x velocity squared

Hence, force = (0.5 x mass x velocity squared) / distance --- (equation 1) This applies for both situation A and B, and given th...