Which of the following would have the highest power rating? 500 j of energy used in 100 seconds 1,000 j of energy used in 100 seconds 500 j of energy used in 50 seconds 1,000 j of energy used in 50 seconds

Bone-strengthening physical activity done increases bone-mineral content and bone density in youth.

Phase changes are chemical changes. true or false

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?