You are conducting an experiment inside a train car that may move along level rail tracks. a load is hung from the ceiling on a string. the load is not swinging, and the string is observed to make a constant angle of 45 degrees with the horizontal. no forces other than tension and gravity are acting on the load. which of the following statements are correct? choose all that apply. a) the train is an inertial frame of reference b) the train is not an inertial frame of reference c) the train may be instantaneously at rest d) the train may be moving at a constant speed in a straight line e) the train may be moving at a constant speed in a circle f) the train must be speeding up g) the train must be slowing down h) the train must be accelerating

b

c

e

h

Explanation:

Note that the swing direction was not giving in the question and direction could be sideways (in a turn) or in a track or both

The question show something in common ...acceleration

So let's look at the statements and pick the correct ones

a is false while b is correct as the train is accelerating

c is correct. The train is accelerating even thou the speed could not be ascertained

d is false and not feasible as the train is accelerating

e is true as the train maybe moving at a constant speed in a circle

f is false. This could be constant velocity in a circle. Same as g (false)

h is true. It's accelerating

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.