Two boxes hit together and stick in a perfectly inelastic collision. If the first box had a mass of 7kg and was going 2 m/s and the second box was 5kg and going -8m/s, what was their combined velocity after the collision?

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

You've already seen the value of 9.8 in this lesson. what's this value called? what quantity does it represent?

Which insurance would contradict the big bang theory