At a constant velocity, you are pulling a 10 kg object with a force P. How much

Question

At a constant velocity, you are pulling a 10 kg object with a force P. How much work is done by P to move 87 cm? Assume kinetic frictional coefficient = 0.10. A 20 kg object is being pulled with F Newton force which has 60 degree with ground. 145 J work is done to move 50 m distance. Assuming a frictionless surface, calculate F. At a constant velocity, you are pulling an object with a force P and 180 J work is done by P to move 10 cm. Calculate the mass of the object? Assume frictional coefficient = 0.20. You are pulling a 10 kg object with a 94 N force which is in 60 degree with floor. How-much work is done to remove 55 cm? Assume kinetic frictional coefficient = 0.50.

Explanation / Answer

Question10:

m =10 kg, uk =0.1, g =9.8 m/s^2, d =87 cm

W = F.s = uk*mg*d = (0.1*10*9.8*0.87)

W= 8.526 J

Question 11:

m =20 kg, theta =60degrees, W =145 J , d =50m

W= F.s = Fdcos(60)

145 =F*50*cos(60)

F = 5.8 N

Question: 12

W =180 J, d =10 cm, uk =0.2

W = F.s = uk*mg*d

180 = (0.2*m*9.8*0.1)

m =918.4 kg

Question: 13

m =10 kg , F =94 N, theta =60 degrees, d =55cm , uk =0.5

W = [94 -(0.5*10*9.8)](0.55)

W= 24.75 J

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