You are conducting an experiment inside an elevator that can move in a vertical shaft. a load is hung vertically from the ceiling on a string, and is stationary with respect to you. the tension in the string is measured to be 10% less than the force due to gravity on the load. no other forces are acting on the load. which of the following statements about the elevator are correct?

The elevator is not a inertial frame of reference.

Explanation:

Lets take load = W

The tension in the string =T

T= (1-0.1 )W

T=0.9 W

From Newtons second law

If elevator move up :

T- W = ma

T= W+ ma

It means that Tension is more than the W .But given that tension is 10% less than W.

If elevator move down:

W- T =  m a

T= W - m a

Yes it is true.It means that elevator is moving downward.

So we can say that the elevator is not a inertial frame of reference.

be subject to a force andchange its motion

wavelength divides in half and speed stays the same.