How does mechanical energy relate to the work an object can do

What are atoms of the same element with varying number of neutrons

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?

Part of a control linkage for an airplane consists of a rigid member cb and a flexible cable ab. if a force is applied to the end b of the member and causes it to rotate by θ = 0.5°, determine the normal strain in the cable. originally the cable is unstretched.