Avolleyball player’s hand applies a 39 n force while in contact with a volleyball for 2 seconds. what is the impulse on the ball? 20 n • s 37 n • s 41 n • s 78 n • s

78 N s

Explanation:

The impulse exerted on the ball is given by:

where

F is the magnitude of the force

is the duration of the collision

In this problem,

F = 39 N

Substituting,

the minimum amperage that the current in this wire would have to have so that its weight is completely supported by the magnetic force due to earth's field, assuming that no other forces except gravity act on it