Posts Tagged ‘kg’

An 62.0 N box of clothes is pulled 5.6 m up a 30.0° ramp by a force of 95 N that points along the ramp. If the coefficient of kinetic friction between the box and the ramp is 0.22, calculate the change in the box’s kinetic energy.

Can u show me what to do???

How long will it take a 1620 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above? again please

A 79 kg person traveling in a car with a speed of 35 m/s slams on the brakes to avoid hitting a squirrel. The car slows to 13 m/s in 0.3 seconds. What force does the person feel during this time?

Compute the initial upward acceleration of a rocket of mass 1.5 x10^4 kg if the initial upward force produced by its engine (the thrust) is 2.7 x10^5 N. Do not neglect the gravitational force on the rocket.

a dockworker loading crates on a ship find that a 18 kg crate, initially at rest on a horizontal surface, requires a 76 N horizontal force to set in motion. However, after the crate is in motion, a horizontal force of 57 N is required to keep it moving witha constant speed. Find the coefficient of static and kinetic friction between the crate and floor.

A student decides to move a box of books into her dormitory room by pulling on a rope attached to the box. She pulls with a force of 130.0 N at an angle of 20.0° above the horizontal. The box has a mass of 25.0 kg, and the coefficient of kinetic friction between box and floor is 0.300.
(a) Find the acceleration of the box.
b) The student now starts the moving box up a 10.0° incline, keeping her 130.0 N force directed at 20.0° above the line of the incline. If the coefficient of friction is unchanged, what is the new acceleration of the box?

A 70 kg woman is standing on the Earth at a height of 2 meters. What is the gravitational force between the woman and Earth (Remember a=g=9.8m/s2)? How does this compare with the gravitational force between the woman and Jupiter (Hint R= the radius of Jupiter)?

I know the gravitational formula but here is my question: Has G changed from the Universal gravitation constant to the one above: a=g=9.8m/s2? And what is R in this case? Is it just 2 or is it the radius of earth or both? Thanks.