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...
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...
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...
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:
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...
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...
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...