& rock is at the top of a 20 meter tall hill. the rock has a mass of 10 kg. how much potential energy does it have?

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.

Determine the age of a fossil if it had only one eighth of its original carbon-14 content remaining?

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