a 2-kg rifle that is suspended by strings fires a 0.01-kg bullet at 200 m/s. the recoil velocity of the rifle is about

Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?

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.

Where should a carbon monoxide detector be mounted?