You use a string to suspend a cork ball with a mass of 40 g from the ceiling of a moving speedboat. The ball and string hang at an angle of 25° from the vertical. Calculate the magnitude of the speedboat's acceleration.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.

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

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this