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homework 28

# homework 28 - homework 28 NOORANI ZOHEB Latest unpenalized...

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homework 28 – NOORANI, ZOHEB 1 Latest unpenalized work: Apr 7 2008 Monday 04:00 (after this date you can not make a perfect score). Work cutoff: Apr 8 2008, 4:00 am. Question 1, chap 14, sect 2. part 1 of 3 10 points Consider a uniform ladder leaning against a smooth wall and resting on a smooth floor at point P . There is a rope stretched horizon- tally, with one end tied to the bottom of the ladder essentially at P and the other end to the wall. The top of the ladder is at a height is h up the wall and the base of the ladder is at a distance b from the wall. The weight of the ladder is W 1 . Jill, with a weight W 2 , is one-fourth the way parenleftbigg d = 4 parenrightbigg up the ladder. The force which the wall exerts on the ladder is F . P W 1 W 2 d T θ h b F Note: Figure is not to scale. The torque equation about P is given by 1. h 4 W 2 + h 2 W 1 = F b 2. ( W 1 + W 2 ) b 2 = F h 3. ( W 1 + W 2 ) h 2 = F b 4. b 4 W 2 + b 2 W 1 = F h 5. h 2 W 2 + h W 1 = F b 6.

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