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Radio waves

First, we need to see what the important information in this problem is: the mass of the student is irrelevant as the problem focusses on the ball. So we now know that the important information is: m = 40...

The force of resistance should be taken away from the driving force to result in a total force of 900N driving forwards.Then use F=ma, rearranged so that a = F/m, to result in an acceleration of 1.34 m/s^...

Stored chemical energy from food is converted into kinetic energy (ke) as the person runs. As they are running uphill, the chemical energy is also converted into gravitational potential energy (gpe). The ...

We know P=IV and that V=IR. Therefore as we are only given I and R in the question we can make the substitution for V so that P=I²R.
By plugging in the numbers we get: P=2²x 12=...