Hey, I\'m having trouble understanding these three problems (A,B,C) I\'m not sur
ID: 2868481 • Letter: H
Question
Hey, I'm having trouble understanding these three problems (A,B,C) I'm not sure why these are giving me so much trouble. I know that because it is uniform circular motion, acceleration will always be perpendicular to the velocity that is tangential to the circle. Meaning that Acceleration will point toward the middle. Please Help!!
Any part of the question would be appreciated!
A bicycle wheel is mounted on a fixed, frictionless axle. A light string is wound around the wheel's rim, and a weight is attached to the string at its free end. The diagrams below depict the situation at three different instants: At t = to,the weight is released from rest. At t = t1, the weight is falling and the string is still partially wound around the wheel. At t = t2, the weight and string have both reached the ground. What is the direction of the angular velocity omega of the wheel at each time shown? If omega = 0 at any time, state that explicitly. Explain. What is the direction of the wheel's angular acceleration alpha at each time shown? If alpha = 0 at any time, state that explicitly. Explain. Rank the magnitudes of the centripetal acceleration of point A at the three times shown (aA0, aA1, aA2). If any of these is zero, state that explicitly. Explain your reasoning.Explanation / Answer
1.
Vt1 = radius*w r*0 = 0 as the weight is at rest
Vt2= -rw ; due to the weight the motion is towards the downward direction
Vt3= rw ; the motion is in the upward direction