1. The 125 kg cart starts from rest and rolls with negligible friction. It is pulled by two ropes as shown below to move it 100 m horizontally to the right.
F2
200 N
30.07
300 N
F:
a
Calculate the net work done on the cart.
b. Find the final velocity of the cart.
c.
What is the average power used by the cart if it takes 70 s to move through the 100 m?

How would you place two electrons on a sphere of radius r so that the electrostatic potential energy is minimized. how would you place three electrons to solve the same problem.

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

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