# science

posted by .

A 100 kg crate is pushed at constant speed up the frictionless 30 degree ramp by a horizontal force vector F. What are the magnitudes of a) vector F and b) the force on the crate from the ramp?

I am not sure how to find part a. What would I need to do to find it? for part b would one of the forces be a normal force, and others (which I am not sure of). How would I find the normal force and others.

(a) The component of the horizontal force F in the direction UP the ramp must be equal and opposite to the component of the weight along the same direction.

F cos 30 = M g sin 30
F = M g tan 30

(b) The ramp exerts both a vertical and horizontal force on the crate. The force vector must be perpendicular to the ramp since ther is no friction.

Let F' be the force you want.
Its vertical component, F' sin 30 must equal the weight, Mg.
Solve for F'

222

## Similar Questions

1. ### Physics

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations. (a) The crate is at rest. Normal …
2. ### Physics

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations. (a) The crate is at rest. Normal …
3. ### Physics

A crate full of artichokes rests on a ramp that is inclined 10.0° above the horizontal. Give the direction of the normal force and the friction force acting on the crate in each of these situations. (a) The crate is at rest. Normal …
4. ### physics

A crate of mass m = 230 kg is pushed at constant speed up the frictionless ramp (θ = 29.0°) by a horizontal force F. What is the magnitude of F?
5. ### physics

a crate of mass m=100k is pushed at constant speed up a frictionless ramp of angel 30 by horizontal force .what are the magnitude of force
6. ### Physics

A rope attached to an engine pulls a 240 Newton crate up an 14.7 degree ramp at a constant speed. The coefficient of kinetic friction for the surfaces of the crate and ramp is .32. What is the magnitude of the force that the rope exerts …
7. ### physics

A crate slides down a ramp inclined at 26.0° from the horizontal. The normal force of the ramp on the crate is 710 N and the coefficient of kinetic friction between the crate’s bottom and the ramp’s surface is 0.330. Find the …
8. ### physics

A 50 kg crate is pushed at constant speed up the frictionless 31° ramp shown in the figure. A)What horizontal force F is required?
9. ### physics

A)A 90 kg crate is pushed at constant speed up the frictionless 34° ramp shown in the figure. What horizontal force F is required?
10. ### Physics

PLEASE HELP! DUE TOMORROW! In a warehouse crates are placed at the top of a ramp and an employee has to slowly (at a constant velocity) lower them down the ramp. Initially the crates are stationary so the employee needs to start them …

More Similar Questions