Which of the following statements is a valid hypothesis for the work we are about to do?

if we change the frequency of the strong vibration, then the length of the string allowed to vibrate will change

if we change the length of the strong allowed to vibrate, then the frequency (had pitch) of the strong vibration will change

if we change the tension of the string allowed to vibrate, then the frequency(and pitch) of the string vibration will change

if we use an oscilloscope, then the frequency (and pitch) of the strong vibration will change

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

C) the periods  of day and night would be fixed all year for anyone at the  equator

The pressure on how fast or slow the car is going