the first stage of saturn v space vehicles consumes fuel at a rate of 15000kg/s with an exhaust speed of 4580m/is. the acceleration of gravity is 9.8m/s^2. calculate the thrust produced by these engines

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

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.

Ais a machine that makes work easier when a single force is applied. a simple machine b compound machine c endangered machine d complex machine