1. A 20 kg object is being pulled with F Newton force which has 60 degrees with

Question

1. A 20 kg object is being pulled with F Newton force which has 60 degrees with ground 112j work is done to move 50 m distance . Assuming a frictional surface , calculate F.
2. At a constant velocity , you are pulling an object with a force P and 187 J work is done by P to move 10 cm. Calculate the mass of the object ? Assume frictional coefficient = 0.20. 1. A 20 kg object is being pulled with F Newton force which has 60 degrees with ground 112j work is done to move 50 m distance . Assuming a frictional surface , calculate F.
2. At a constant velocity , you are pulling an object with a force P and 187 J work is done by P to move 10 cm. Calculate the mass of the object ? Assume frictional coefficient = 0.20.
2. At a constant velocity , you are pulling an object with a force P and 187 J work is done by P to move 10 cm. Calculate the mass of the object ? Assume frictional coefficient = 0.20.

Explanation / Answer

1. W = Fdcosø

112 = F(50)cos(60)

F = 4.48 N

2. In this case:

Wp = Px = 187

P(0.10) = 187

P = 1870 N

In the vertical axis

N-mg = 0

N = mg

In the horizontal axis:

fr = P = uN
P =u(mg)

1870=(0.20)(m)(9.81)

m = 953.1 kg

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