# Physics

posted by .

a barrel of oil at rest has a mass of 65kg it is rolled down a 1.2m ramp. Due to constant force exerted on it, the barrel reaches a velocity of 4.2 m/s upon leaving the ramp. Find the constant force on the barrel while it is on the ramp?

• Physics -

It is unclear whether the barrel is rolling or sliding. If one assumes sliding down a frictionless ramp,

F=ma
where vf^2=2a*4.2 or a=vf^2/8.4
solve for f.

Now, if rolling, come back and say so, it is more complicated.

• Physics -

rolling down a ramp not sliding

• Physics -

Now if it is rolling, the filled barrel has a moment of inertia of 1/2 Mr^2

The angular velocity at the bottom must be w=Vf/r

KE at bottom=PE at top
1/2 I w^2+ 1/2 m vf^2=mgh
so solve for h.

## Similar Questions

1. ### physics

A 20.0kg mass is placed a the top of a 3.5m long, 15degree ramp. When released from rest, the mass accelerates down the ramp. The frictional force acting on the mass is 11.0 N. What is the velocity of the mass at the bottom of the …
2. ### physics

A toy car is given a quick push so that it moves on an inclined ramp. After it is released, it moves up, reaches its highest point and moves back down again. Friction is so small it can be ignored. What net force acts on the car?
3. ### physics

a 40 kilogram barrel is rolled up a 10 meter long ramp to a height of 5 meter how much does the barrel weigh
4. ### Physics

A 75.0g bullet is fired at a muzzle velocity of 476 m/s from a gun with a mass of 4.75kg and a barrel length of 60.0cm. a. How long is the bullet in the barrel?
5. ### physics

A 50kg barrel of Bud is rolled up a 10 meter ramp to the back of the truck.The ramp makes a 30degree angle with the ground. What is the potential energy of the barrel at the top of the ramp?
6. ### physics

You are pushing a box up an inclined ramp. The force you exert on the box is 19·N up the ramp. The weight of the box is 100·N straight downward. The force friction exerts on the box is 8·N down the ramp. The normal force exerted …
7. ### PHYSICS

A dock worker is loading a 25 kg solid cylindrical barrel to a ship by rolling it up a 9 meter long and 1.5 meter high ramp. At the top of the ramp the dock worker stop to go around the barrel but he loses the grip and the barrel starts …
8. ### prealgebra

A barrel shaped like a cylinder is laid on its side and rolled up a ramp. The barrel has a circular base that is 0.9m in diameter. If the barrel turns 37 times in being rolled up the ramp, how long is the ramp?
9. ### physics

Starting from rest, a 10kg suitcase slides down a 3.00m long ramp inclined at 30 degrees from the floor. The coefficient of friction between the suitcase and the ramp is 0.35. 1) what net force is applied to the suitcase while it is …
10. ### Physics

Starting from rest, a 10.0 Kg suitcase slides down a 3.00m long ramp inclined at 30.0 degrees from the floor. The coefficient of friction between the suitcase and ramp is .35. A: what net force is applied to suitcase while it is on …

More Similar Questions