Homework 7

Homework 7 - homework 07 BAUTISTA ALDO Due Feb 6 2006 4:00...

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homework 07 – BAUTISTA, ALDO – Due: Feb 6 2006, 4:00 am 1 Version number encoded for clicker entry: V1:1, V2:4, V3:2, V4:4, V5:3. Question 1 Part 1 of 2. 10 points. A book is at rest on an incline as shown above. A hand, in contact with the top of the book, produces a constant force F hand vertically downward. F hand Book The following figures show several attempts at drawing free-body diagrams for the book. Which figure has the correct directions for each force? Note: The magnitude of the forces are not necessarily drawn to scale. 1. weight friction normal force 2. weight force friction normal correct 3. weight friction force normal 4. normal force friction weight 5. weight normal friction force 6. weight force normal friction 7. weight force normal friction 8. normal friction weight force Explanation: The normal force points perpendicular to the surface of the inclined plane. The weight force points down. The F hand also points down. The friction force keeps the book from sliding and consequently points up the incline. Question 2 Part 2 of 2. 10 points. For the normal force exerted on the book by the wedge in the diagram, which force(s)

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homework 07 – BAUTISTA, ALDO – Due: Feb 6 2006, 4:00 am 2 complete(s) the force pair for Newton’s third law (action-reaction)? 1. the component of F hand pointing perpen- dicular to the surface of the incline 2. the pull of the earth on the book 3. the normal force exerted on the wedge by the book correct 4. the pull of the book on the earth 5. the component of gravity pointing parallel to the surface of the incline 6. the component of gravity pointing per- pendicular to the surface of the incline 7. the sum of the component of gravity per-
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