What is the purpose of the pointer in the Sargent-Welch apparatus? a. It provides a frictional force on the bob to slow down the rotation

b. It provides a visual guide to the experimenter to determine the correct weight to put in the bucket

c. It provides a normal force on the bob to counteract the bob's weight

d. It provides a visual guide to the experimenter to determine the correct rotational speed

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

Amoving electron has kinetic energy k1. after a net amount of work w has been done on it, the electron is moving one-quarter as fast in the opposite direction. (a) find w in terms of k1. (b) does your answer depend on the final direction of the electron's motion?

Of is j/kg·k. if a 2.6 kg of isk to k, is ?