What is the size of the frictional force acting on the, Ask an Expert

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Question1

Two boys are pulling a car of mass 800 kg along a level surface with a pair of ropes attached horizontally. While the pull on each rope is 400N in the directions indicated, acceleration of the car is 0.1ms-2. What is the size of the frictional force acting on the car in above situation?

Question2

A 105 ball is tied to a string. It is pulled to an angle of 8.00 and free to swing as a pendulum. A student with a stopwatch finds that 11 oscillations take 18.5.How long is the string?

Question3

An astronaut's normal weight it 600 Newton's. How much will she weigh while orbiting in a satellite at 12,000 kilometres [two earth radii] above the surface of Earth?

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