PHYSICS 15A Final: PHYS15A Harvard Final
Document Summary
Final exam, 5/24/06: in the atwood"s machine below, what should m be (in terms of m1 and m2) so that it (m ) doesn"t move? (the pulleys and strings are massless. ) M m1 m2: a carousel rotates counterclockwise with angular frequency with respect to the ground. Write down the radial f = ma statement, and use it to nd the friction force. (b) in the carousel frame, draw the free-body diagram (for the horizontal forces) on the person. Assume that only a negligible length of the rope starts out below the support. Find the force that the support applies to the rope, as a function of time. hand. L: an observer on the ground sees two trains, a and b, both of proper length l, move in opposite directions at speed v with respect to the ground. She notices that at the instant the trains overlap, clocks at the front of a and rear of b both read zero.
