A uniform, 249 N rod that is 1.97 m long carries a 225-N weight a s right end an

Question

A uniform, 249 N rod that is 1.97 m long carries a 225-N weight a s right end and an unknown weight W toward the left end (see the figure (Figure 1) When W is placed 51.3 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 83.0 cm from the right end. Part A Find W = 236 N Correct Significant Figures Feedback: Your answer 236.29N was either rounded differently or used a different item, keep all the digits and round as the final step before submitting your answer. Part B If W is now moved 20.4 cm to the right, how far must the fulcrum be moved to restore balance? delta x = ___________ m Part C If W is now moved 20.4 cm to the right, in what direction must the fulcrum be moved to restore balance? to the left to the right

Explanation / Answer

b) By balancing torque about right end of rod,

236*(197-20.4-51.3) +249*197/2 = (249+236+225)*x

x = 54097/710 cm

= 76.2 cm

delta x = 83.0-76.2 =6.8 cm

= 0.068 m

c) to the right

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