Awrecking ball is suspended from a 7.0-m-long cable that makes a 25 ? angle with the vertical. the ball is released and swings down. part a what is the ball's speed at the lowest point? what is the ball's speed at the lowest point? 7.2 m/s 5.1 m/s 3.6 m/s 2.5 m/s

Which of the following is the best name for mgcl2

The protons in a nucleus are approximately 2 ✕ 10^−15 m apart. consider the case where the protons are a distance d = 1.93 ✕ 10^−15 m apart. calculate the magnitude of the electric force (in n) between two protons at this distance.

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.