True or false when a person swims through water no work is done

A heat pump with a COP of 3.15 is used to heat an air-tight house. When running, the heat pump consumes 5 kW of power.

For a ball that is dropped from rest, what is its average velocity from t=1s to t=2s?

A car moves along a horizontal road with constant velocity v0 = v0xi until it encounters a smooth inclined hill, which it climbs with constant velocity v1 = v1xi + v1yj as indicated in the figure.

1. Explain the importance of doing muscular strength and muscular endurance activities.

Which of these experiments would make use of quantitative data? A. a Study of the different amounts of time it takes water to evaporate completely. B. a Study of the effects of water temperature on fading colors in cloths. C.

What causes standing wave?

If you lived downhill from a volcano and lava started to flow toward your home what could happen?

A battleship simultaneously fires two shells toward two identical enemy ships. One shell hits ship A, which is close by, and the other hits ship B, which is farther away. The two shells are fired at the same speed.

A horse canters away from its trainer in a straight line, moving 37 m away in 9.1 s. It then turns abruptly and gallops halfway back in 1.8 s. Calculate its average speed for the entire trip. Express your answer using two significant figures.

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 7000 N {/rm N}.