A 50-kg bicyclist coasts up a hill. What is the cyclist change in kinetic energy as her altitude changes from 15m to 20m?
A) 0 joules
B) approximately 2,500 joules
C) approximately 7.500 joules
D) approximately 10.000 joules

Atoaster oven has a resistive heating element. the average rate at which it dissipates energy as thermal energy is 1.00 \(\rm kw\). in the united states, emf amplitude in household circuits is \(\mathcal e_{\max}\) = 170 \({\rm \; v}\) and the \(\rm ac\) oscillation rate is 60 \(\rm hz\). part a what is the root-mean-square current through the heating element?