Problem 7.23 Tom and Jerry both push on the 2.80-m-diameter merry-go-round shown
ID: 1284093 • Letter: P
Question
Problem 7.23
Tom and Jerry both push on the 2.80-m-diameter merry-go-round shown in (Figure 1) . Tom pushes with a force of 47.5N and Jerry pushes with a force of 36.0N .
Part A
What is the net torque on the merry-go-round?
Express your answer to three significant figures and include the appropriate units.
Part B
What is the net torque if Jerry reverses the direction that he pushes by 180? without changing the magnitude of his force?
Express your answer to three significant figures and include the appropriate units.
Problem 7.23 Tom and Jerry both push on the 2.80-m-diameter merry-go-round shown in (Figure 1) . Tom pushes with a force of 47.5N and Jerry pushes with a force of 36.0N . Part A What is the net torque on the merry-go-round? Express your answer to three significant figures and include the appropriate units. Part B What is the net torque if Jerry reverses the direction that he pushes by 180? without changing the magnitude of his force? Express your answer to three significant figures and include the appropriate units.Explanation / Answer
A) Tnet = F_T*r*sin(60) - F_J*r*sin(80)
= 47.5*1.4*sin(60) - 36*1.4*sin(80)
= 7.95 N.m
B)
Tnet = F_T*r*sin(60) + F_J*r*sin(80)
= 47.5*1.4*sin(60) + 36*1.4*sin(80)
= 107.23N.m