PLEASE HELP ASAP. Best answer gets BRAINIEST:

a counter weight of 13.5kg is used to help a person of a mass 62.4kg do chin ups

1. Calculate the force applied by the person if he accelerates at 1.9m/s^2
2. calculate the magnitude of the tension in the wire.

1. Force = -623.43 N

2.Tension = 106.65 N

Explanation:

Let us call the bigger mass , and the smaller mass .

Since the two masses are connected to each other, they must experience same acceleration (if they didn't, the unequal acceleration will cause the string to break. )

From the free body diagram, the forces acting on the mass are

,

and according to Newton Second Law, this causes acceleration ; therefore,

(1).  .

Similarly, the forces acting on the mass are

,

which causes the acceleration (upward); therefore,

or

From this equation we solve for and get:

We put this into equation (1) and get:

putting in and , we get:

The tension in the wire is

It does not.

The speed at which the earth rotates determines the length of the day.