A book is being pushed to the right across a desk with a constant acceleration. What is the force?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?

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.