A 20.0-g ball hangs from the roof of a freight car by a string. When the freight car begins to move, the string makes an angle of 35.0° with the vertical. (a) What is the acceleration of the freight car? (b) What is the tension in the string?

(a)

(b)

Explanation:

Given data

Angle α=35.0°

Mass m=20g=0.02 kg

To find

(a) Acceleration a

(b) Tension T

Solution

For part (b) tension T

From Newtons Second Law the Tension on string is given b

For part(a) acceleration

The acceleration is given by:

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