Which statement best describes the energy changes that occur while a child is riding on a sled down a steep, snow-covered hill? a kinetic energy decreases and potential energy increases. b kinetic energy increases and potential energy decreases. c both potential and kinetic energy decrease. d both potential and kinetic energy increase.

Aresearcher plans to conduct a test of hypotheses at the 1% significance level. she designs her study to have a power of 0.90 at a particular alternative value of the parameter of interest. the probability that the researcher will commit a type ii error for the particular alternative value of the parameter at which she computed the power is: a. 0.90. b. 0.01. c. 0.10. d. equal to 1

All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction

Astone is thrown into a pond. what happens to the amplitude of the resulting waves as they get farther from the point where the stone hit the water? explain.