# Search results

1. ### Rotation only of yo-yo

Homework Statement Realize I'm asking a lot of question today, but I'm working on a huge physics project and I'm not asking for answers, just some guidance where I'm stuck A certain yo-yo can be modeled as a uniform cylindrical disk with mass M and radius R and a lightweight hub of radius...
2. ### The creation of the moon (a kind of conceptual problem

Homework Statement One likely theory for the origin of the Moon is that it was formed by the impact of a Mars-sized object on the young Earth. How fast would the object have to be going when it hit the Earth to vaporize enough rock to make the Moon? Homework Equations The Attempt...
3. ### Dam problem!

Homework Statement Consider a simple model of a dam. A reservoir of water behind the dam is filled to a height h. Assume that the width of the dam is L. As the reservoir behind a dam is filled with water, the pressure that the water exerts on the dam increases. Eventually, the force on the...
4. ### Orbits of planets/Angular momentum

Homework Statement Show that the angular momentum in circular orbit around a mass M can be written as functions of just the masses, the orbit radius, and G. Homework Equations L = r x p = r x mv L = Iw The Attempt at a Solution I had no trouble showing that the total...
5. ### Angular velocity of a yo-yo!

Homework Statement A certain yo-yo can be modeled as a uniform cylindrical disk with mass M and radius R and a lightweight hub of radius ½R. A light string is wrapped around the hub. (a) First, the yo-yo is allowed to fall. Find the angular velocity of the yo-yo when the string has...