a 20-kg child descends a slide 3.0 m high and reaches a speed of 2.4 m/s when she hits the bottom. how much thermal energy due to friction is generated during the process?

Positrons are spontaneously emitted from the nuclei of

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match