5.12 Problem 5.12 Part A A horizontal rope is tied to a 70 kg box on frictionles

Question

5.12

Problem 5.12 Part A A horizontal rope is tied to a 70 kg box on frictionless ice. What is the tension in the rope if the box is at rest? Express your answer using two significant figures. DVD ANO tr Ce ? Submit My Answers Give Up Part B What is the tension in the rope if the box moves at a steady 8.0 m/s? Express your answer using two significant figures. DVD AE tr Ce ? Submit My Answers Give Up Part C What is the tension in the rope if the box has 1, -8.0 m/s and a. 5.0 m/s ? Express your answer using two significant figures. Vo Azo h a o o ? Submit My Answers Give Up

Explanation / Answer

A] Here, the frictional force is zero

so, if the box is at rest, the net force on the box is zero and so the tension in the rope will be zero. T = 0 N.

B] The acceleration of the box is zero and so the net force on the box will be zero. Therefore, the tension will be still be zero. T = 0 N.

C] The net force on the box will be equal to the tension in the rope since there is no other force.

Therefore, T = ma = 70 x 5 = 350 N.

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