# Homework H.4.G

## 7 thoughts on “Homework H.4.G”

1. jone1871 says:

How would we go about turning the ds integral from the work energy equation into something more useful? I'm trying to use the angle of the collar wrt the center of the arc to calculate the work but I'm having trouble setting up the integral.

1. Qianyu Zhao says:

Recall that only displacement along the direction of force will contribute to the work.

1. jone1871 says:

Ok, due to the nature of the force F, I need a theta value to get the projection of F onto the path unit vector. If I translate to polar coordinates and use e^theta could I just change the ds into a dtheta?

1. Qianyu Zhao says:

The equation is formed to indicate that only displacement along e_t direction will be dotted with no conservative force. And itâ€™s usually expressed in Cartesian. You may refer to the example on P214.

2. Nathan DeGraaff says:

Would the best way to work this problem be to solve for the h in the rocket's final potential energy and relate that to s using trig?