13. A 0.13 kg toy rocket uses 8 J of chemical energy to reach a maximum height of 0.60m.
a) What is the rocket's potential energy at its maximum height?
b) How much energy was "lost" to heat energy during the launch of the rocket? (Remember that the KE is zero at the maximum height.)​

The image below shows numerous volcanic mountains in the pacific northwest. what is the most likely cause of the volcanic and earthquake activity in this region?

Could someone me find the answer to this problem.

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.