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F - Chapter F Problems Blinn College Physics 2425 Terry...

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Chapter F - Problems Blinn College - Physics 2425 - Terry Honan Problem F.1 A 600 N force pushes a refrigerator 8 m along a floor. What is the work done by the force? Problem F.2 Junior lifts a 20 N weight slowly (assume zero acceleration at all times) a distace of 1.5 m. What is the work done by Junior and what is the work done by gravity? Problem F.3 Consider the vectors A = X - 2, 5, - 3 \ and B = X - 1, 0, 2 \ . (a) What is the angle between the two vectors? (b) What is the angle between A and the positive z axis? Problem F.4 A 20 N block, initially at rest, is dragged 5 m along a horizontal floor by a rope. The rope has a tension of 12 N and makes an angle of 25 ° above horizontal. A friction force of 9 N acts backward. (a) There are four forces acting: the tension, friction, the normal force and gravity. What is the work done by each force? (b) What is the final speed of the block? Problem F.5 Consider a force of F H x L = 6 x 2 - 20 (in SI units). If this acts on a body that moves from x = 2 m to x = 4 m then what is the work done by the force?
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