Problem 8.5 MasteringPhysics 5 of 18 Problem 8.5 You\'re carrying a 3.0- m -long

Question

Problem 8.5 MasteringPhysics 5 of 18 Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Continue
Problem 8.5 MasteringPhysics 5 of 18 Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Continue
Problem 8.5 MasteringPhysics 5 of 18 Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Continue Problem 8.5 MasteringPhysics Problem 8.5 MasteringPhysics Problem 8.5 MasteringPhysics Problem 8.5 MasteringPhysics 5 of 18 Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Continue Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Continue Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Problem 8.5 Problem 8.5 You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. You're carrying a 3.0-m-long, 25kg pole to a construction site when you decide to stop for a rest. You place one end of the pole on a fence post and hold the other end of the pole 35 cm from its tip. Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up Part A How much force must you exert to keep the pole motionless in a horizontal position? Express your answer using two significant figures. F =   N   SubmitGive Up F =   N   F =   N   SubmitGive Up Continue F =   N  

Explanation / Answer

If you were holding it at the end, your approach would be valid. But since you're holding it closer to the CM than the fence post is, you get more of the weight. Sum the moments about the fence post: the sum must be zero, or the pole would be rotating:
0 = F * (3 - 0.35)m - 25kg * 9.8m/s

Related Questions

Navigate

• Browse (All)
• Browse P
• Subjects

---