You calculate that it would take a piece of paper 0.5 seconds to fall from your hand to the ground if there were no air resistance. In reality, how long will it
take the paper to reach the ground?

Which type of wave can travel without a medium

Aballoon is rising vertically upwards at a velocity of 10m/s. when it is at a height of 45m from the ground, a parachute bails out from it. after 3s he opens his parachute and decelerates ata a constant rate 5m/s.when. (a) what was the height of the parachutist above the ground when he opened his parachute? (b)how far is the parachutist from the balloon at t=3s? (c)with what velocity does the parachutist hit the ground? (d)after how long does the parachutist hit the ground after his exist from the balloon?

If the pressure in a gas is doubled while its volume is held constant. true or false