Spinning on String of Variable Length Video Lessons

Video Thumbnail

Example

Problem: A small puck moves in a circle on a frictionless air table. The circular motion is enforced by a person holding a string tied to the puck and going through a tiny hole in the middle of the table. Initially, the puck moves in a circle of radius R at speed v. But later the string is pulled down through the hole forcing the puck to move in a smaller circle of radius 1/2 R. How much work did the person do while moving the puck from R to 1/2 R? 1. W =3/4 mv2 2. W =3/2 mv2 3. W = mv2 4. W =5/2 mv2 5. W =2/3 mv2 6. W =1/3 mv2 7. W =4/3 mv2 8. W = 2mv2 9. W =1/4 mv2 10. W =1/2 mv2

FREE Expert Solution
93% (90 ratings)
Problem Details

A small puck moves in a circle on a frictionless air table. The circular motion is enforced by a person holding a string tied to the puck and going through a tiny hole in the middle of the table. Initially, the puck moves in a circle of radius R at speed v. But later the string is pulled down through the hole forcing the puck to move in a smaller circle of radius 1/2 R. How much work did the person do while moving the puck from R to 1/2 R?

1. W =3/4 mv2

2. W =3/2 mv2

3. W = mv2

4. W =5/2 mv2

5. W =2/3 mv2

6. W =1/3 mv2

7. W =4/3 mv2

8. W = 2mv2

9. W =1/4 mv2

10. W =1/2 mv2

Frequently Asked Questions

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 Spinning on String of Variable Length concept. You can view video lessons to learn Spinning on String of Variable Length. Or if you need more Spinning on String of Variable Length practice, you can also practice Spinning on String of Variable Length practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Jeffery took 9 minutes and 4 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

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