Read the hypothesis below. hypothesis: if a steel surface is wet with water, then the friction will be reduced. which question best matches this hypothesis? a. how is water affected by the force of friction? b. how will water affect the force of friction? c. does water or steel have a greater frictional force? d. what is the force of friction of water?

Can anybody me with this? ? (picture included.)

The field between two charged parallel plates is kept constant. if the two plates are brought closer together, the potential difference between the two plates either a) decrease b) does not change c) increase?

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?