Question

At the airport, you pull a 18 kg suitcase across the floor with a strap that is at an angle of 40 ∘ above the horizontal.

Part A

Find the normal force.

Express your answer using two significant figures.

N = ______N  

Part B

Find the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40.

Express your answer using two significant figures.

F =_______N  

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At the airport, you pu a 18 suitcase across the floor with a strap that is at an angle of 40 above the horizontal. Part A Find the normal force. Express your answer using two significant figures. 76 Submit MLAnswers Part B Find the tension in the strap, given that the suitcase moves with constant speed and that the coefficient of kinetic friction between the suitcase and the floor is 0.40, Express your answer using two significant figures. a 178.7 Submit My Answers up

Answer 1

$The\; normal\; force,N=mg-T\sin \theta$

$N=(18)(9.8)-T\sin(40^{o})$

$N=176.4-0.643T$

$The\; frictional\; force=\mu\,N=T\cos\theta$

$0.4(176.4-0.643T)=T\cos(40^{o})$

$N=176.4-0.643T=176.4-0.643(50.07)=144.20\,Newtons$

$PartB)\,Tension=50.07\,Newtons$