What is the magnitude of the average frictional force exerted on the block by th

Question

What is the magnitude of the average frictional force exerted on the block by the rough section of the surface? 30 N 12 N 4.5 N 4 N 3 N A rocket lifts a payload upward from the surface of Earth. The radius of Earth is R, and the weight of the payload on the surface of Earth is W. The force of Earth's gravity on the payload is W/2 when the rocket's distance from the center of Earth is R squareroot R 2R 2 squareroot R 4R In a lab a block weighing 80 N is attached to a spring scale, and both are pulled to the right on a horizontal surface, as shown above. Friction between the block and the surface is negligible. What is the acceleration of the block when the scale reads 32 N? 2 0 m/s^2 2.5 m/s^2 4.0 m/s^2 6.0 m/s^2 8.0 m/s^2

Explanation / Answer

11)

let the frictional force is f

Using second law of motion

FOrce * time = change in momentum

F * 0.5 = 3 * (3-5)

F = - 12 N

the magnitude of frictional force is 12 N

12)

let the distance of centre of earth is x

G * M * m/R^2 * 0.5 = G * m * M/x^2

x = sqrt(2) * R

the correct option is sqrt(2) * R

13)

let the acceleration of the block is a

Using second law of motion

F = m * a

32 = (80/10) * a

a = 4 m/s^2

the acceleration of the block is 4 m/s^2

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