A string is fixed at both ends. The mass of the string is 0.0040 kg and the length is 8.00 m. The string is under a tension of 500.00 N. The string is driven by a variable frequency source to produce standing waves on the string. Find the wavelengths (in m) and frequency (in Hz) of the first four modes of standing waves.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

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?

When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the force that the object exerts?