If the frequency in question #1 were

changed to 20 Hz, what would the

wavelength of that wave be?

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?

In the first law of thermodynamics, triangle e=q-w, what does q stand for

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?