A block sliding on a frictionless table is attached to a string that passes through a narrow hole through the tabletop. Initially, the block is sliding with speed in a circle of radius A student under the table pulls slowly on the string. What happens as the block spirals inward? Give supporting arguments for your choice. (The term angular momentum refers to the angular momentum about a vertical axis through the hole.) (a) Its energy and angular momentum are conserved. (b) Its angular momentum is conserved and its energy increases. (c) Its angular momentum is conserved and its energy decreases. (d) Its energy is conserved and its angular momentum increases. (e) Its energy is conserved and its angular momentum decreases.

tran (mmt2449) – Homework 04 – yao – (56695) 1 This print-out should have 26 questions. v 2 L = 0 Multiple-choice questions may continue on 2▯g the next column or page – ﬁnd all choices before answering. So the distance is proportional to the square of the initial speed. 001 10.0 points A 3.14 g bullet moving at 388 m/s penetrates 003 10.0 points Karen has a mass of 52.7 kg as she rides a tree to a depth of 6.28 cm. Use energy considerations to ﬁnd the aver- the up escalator at Woodley Park St