Problem: A person spins a tennis ball on a string in a horizontal circle in the x−y plane as shown in the image. The ball is moving clockwise when viewed from above. Just when the string is parallel with the y-axis, the ball is hit with a force in the direction of the ball’s velocity. This causes a change in the ball’s angular momentum ΔL in the1. The angular momentum does not change (zero torque).2. +z direction3. −z direction4. +x direction5. −x direction6. +y direction7. −y direction

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Problem Details

A person spins a tennis ball on a string in a horizontal circle in the x−y plane as shown in the image. The ball is moving clockwise when viewed from above. Just when the string is parallel with the y-axis, the ball is hit with a force in the direction of the ball’s velocity. This causes a change in the ball’s angular momentum ΔL in the

1. The angular momentum does not change (zero torque).

2. +z direction

3. −z direction

4. +x direction

5. −x direction

6. +y direction

7. −y direction

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Intro to Angular Momentum concept. You can view video lessons to learn Intro to Angular Momentum. Or if you need more Intro to Angular Momentum practice, you can also practice Intro to Angular Momentum practice problems.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Yao's class at TEXAS.