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1. ### Centripetal Force and Tangential Velocity

Homework Statement Suppose a string of negligible mass can support a mass of .025 kg when hanging vertically. The string is 4.23 m long (radius). If you add another weight and spin the string horizontally in a circular pattern above your head, the string will break upon reaching a tangential...
2. ### Force that Maintains Circular Motion

Homework Statement A string with the length of 4.23 m can support a weight of 25 g. If you add a weight and spin the string horizontally above your head, it breaks upon reaching a tangential velocity of 5.1 m/s. What is the mass of the weight? so... radius=4.23m, V(t)=5.1 m/s, and...
3. ### Momentum Conservation and Collisions Concept?

Thank you very much!
4. ### Momentum Conservation and Collisions Concept?

Homework Statement A 100 kg man and a 90 kg man are rounding a corner and collide. The heavier man is running, while the 90 kg man is walking. What happens to the momentum of the 100 kg man? Does it increase, decrease, stay the same, or "is conserved"? Homework Equations Change in...
5. ### Conservation of Momentum and linear momentum

Thanks for the responses! So, when you say that it must remain in a closed environment, are you saying the answer would be the one dealing with lightning or the one dealing with outer space.. sorry I'm still a bit confused. :confused:
6. ### Conservation of Momentum and linear momentum

Homework Statement In which one of the following situations is linear momentum not conserved? A) A bomb suspended by a string explodes into one hundred fragments. B) A bowling ball collides with ten pins. C) A golf ball is struck by a club. D) An astronaut floating in space throws a hammer...
7. ### Physics Concepts Force and Work Help

Thank you sooooo much for all of your help! I think I understand these concepts now :)
8. ### Physics Concepts Force and Work Help

Thanks for the help! Now, would weighing fruit on a spring scale be elastic potential energy also? That was my initial thought, but I then realized that the main focus on a scale is the mass, which is only in an equation for GRAVITATIONAL potential energy...
9. ### Physics Concepts Force and Work Help

Homework Statement 1. What type of energy is involved in weighing something on a spring scale? 2. What type of energy is involved in winding a watch? 3. Is a machine's efficiency increased if the work done against the resistance force is decreased or if you decrease the work against...