A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled's potential energy? (Formula: PE = mgh)

The human body stores chemical energy from digested food. some of the chemical energy is converted into mechanical energy when the body moves. which statement best supported by this information

Africtionless piston-cylinder contains 50 l of saturated liquid r-134a. the piston has a mass and an area resulting in an applied pressure of 500 kpa on the refrigerant. the refrigerant is now heated until its temperature rises to 70∘c. calculate the work (in kj) done during this process.

You notice the birds sitting on the electrical wires which of the following explain why the birds don't get shocked