If the velocity of a moving object decreases from 60 m/s to 30 m/s, what happens to its momentum? (2 points) Group of answer choices It is reduced by half It doubles It stays the same It quadruples

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

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.

Which of the following is another term for a planned economy