iFat
Nov27-08, 02:48 PM
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution
The question is if a meter stick is drawn in a bow so that it has 40 J of potential energy. When fired horizontally, the meter stick will have kinetic energy of _____.
A) Less than 40 J B) More than 40 J C) 40 J
I think it's C because of the conversation law. Energy can't be created or destroyed, but transformed. The energy is changing from potential energy to kinetic energy, but then I say it might be A.
The Winterchester Potato Cannon applies a 6000N average force to a 0.5 kg potato while the potato is in the 1.5 meter barrel. Assuming no friction, what is the change in KE of the potato?
A) 9000 J B) 6000 J C) 0J D)4500 J E) 4000J
For this question, I'm extremely confused. I don't even know what it's asking.
A pendulum is lifted so that it is raised 5 meter above its lowest position. When released, what is its maximum speed?
A) 5 m/s B) 7.07 m/s C) 10 m/3 D) 100 m/s E) need to know the mass
For this question, I think you have to know the mass because the formula is KE = 1/2mv^2. How can you figure out the maximum speed without the mass.
Last question, which of the following are not units of Power?
A) Nm/s B) J/s C) kgm2/s3 D) W E) Jm/s
I think it's C and E. I just wanted to double check just to make sure that answer was correct.
2. Relevant equations
3. The attempt at a solution
The question is if a meter stick is drawn in a bow so that it has 40 J of potential energy. When fired horizontally, the meter stick will have kinetic energy of _____.
A) Less than 40 J B) More than 40 J C) 40 J
I think it's C because of the conversation law. Energy can't be created or destroyed, but transformed. The energy is changing from potential energy to kinetic energy, but then I say it might be A.
The Winterchester Potato Cannon applies a 6000N average force to a 0.5 kg potato while the potato is in the 1.5 meter barrel. Assuming no friction, what is the change in KE of the potato?
A) 9000 J B) 6000 J C) 0J D)4500 J E) 4000J
For this question, I'm extremely confused. I don't even know what it's asking.
A pendulum is lifted so that it is raised 5 meter above its lowest position. When released, what is its maximum speed?
A) 5 m/s B) 7.07 m/s C) 10 m/3 D) 100 m/s E) need to know the mass
For this question, I think you have to know the mass because the formula is KE = 1/2mv^2. How can you figure out the maximum speed without the mass.
Last question, which of the following are not units of Power?
A) Nm/s B) J/s C) kgm2/s3 D) W E) Jm/s
I think it's C and E. I just wanted to double check just to make sure that answer was correct.