The 8.00-cm long second hand on a watch rotates smoothly.
what is its angular velocity?
what is the speed of the tip of the hand?

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.

Most short-period comets do not have randomly oriented orbits because

What are the north and south poles of a solenoid change with?