The terminal speed of a skydiver is 160 km/h in the spread eagle position and 310 km/h in the nosedive position. assuming that the diver’s drag coefficient c does not change from one position to the other, find the ratio of the effective cross-sectional area a in the slower position to that in the faster position.

Jackson is designing a new heater, and he wants to experiment with different thermally conductive materials. which of these materials would be useful in conducting heat?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

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?