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**Please help i'm totally lost an i don't understand how to do these problems.**

Could u please explain these problems out so i can better understand them and solve too.I am failing physics right now that's how clueless i am about this subject.

Could u please explain these problems out so i can better understand them and solve too.I am failing physics right now that's how clueless i am about this subject.

1. Consider two uniform solid spheres where both have the same diameter, but on has twice the mass of the other. The ration of the larger moment of inertia to that of the smaller moment of inertia is?

2. A force is applied to the end of a 2 ft long uniform board weighing 50 lb, in order to keep it horizontal, while it pushes against a wall at the left. If the angle the force makes with the board is 30 degrees in the north western direction, the magnitude of the applied force F is?

3. A solid ball, solid cylinder and a hollow pipe all have equal masses and radii. All three are released simultaneously at the top of an inclined plane, which will reach the bottom first?

4. A hoop of radius 0.5 m and a mass of 0.2 kg is released from rest 5 meters above the horizontal and allowed to roll down an inclined plane. How fast is it moving when it is 2 meters above the horizontal?

5. A wheel with a rotational inertia of 8.0 kg-m ^2 and a rotational kinetic energy of 155 Joules requires what torque to bring it to rest in 4.0 s?

6. A diver can change her rate of rotation in the air by "tucking" her head in and bending her knees. Let's assume that when she is stretched out straight she is rotationg at 1 revolution per second. Now she goes into the "tuck and bend," effectively shortening the length of her body by half. What will her rate of rotation be now?

**Please help i am very clueless on where to start of how to finish these problems. I don't know anything about physics.**

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