A 75.0 kg man pushes on a 500,000 kg wall for 250s but it does not move. A) How much work does he do on the wall?
B) How much energy is used?
C) How much power is exerted?

If gases like carbon dioxide and methane make up less than 1% of the total atmosphere, why is it important for scientists to monitor changes in percentages of these gases?

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

Multiply or divide to make this english distance conversion. 174 inches = feet (14.5, 58, 2,088, 23)