On an essentially frictionless, horizontal ice rink, a skater moving at 5.0 m/sm/s encounters a rough patch that reduces her speed by 49 %% due to a friction force that is 30 %% of her weight. Use the work–energy theorem to find the length of this rough patch.

Balloon a has charge q, and identical mass balloon b has charge 10q. you hang them from threads near each other. choose all of the statements with which you agree. check all that apply. a. a and b exert the same magnitude forces on each other. b. the force that a exerts on b is 10 times the force that b exerts on a. c. the angle between the thread supporting a and the vertical is < the angle between the thread supporting b and the vertical. d. the force that a exerts on b is 1/10 the force that b exerts on a.

How does the electric potential energy between two charged particles change if one particle is reduced by a factor of 3? a. increased by a factor of 3 b. it is decreased by a factor of 9 c. it is reduced by a factor of 3 d. it is increased by a factor of 9

How much energy is supplied to each coulomb of charge that flows through a 12-v battery?