HW07Sol(2)

# HW07Sol(2) - Jim Guinns PHYS2211 Assignment #7 Solutions...

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Due Mon., Feb. 15, 2010 1. a.) What is the gravitational force of attraction between the Sun and Moon? (For the Sun- Moon distance, use the Sun-Earth distance, this and the needed masses are in the inside back cover of the textbook.) Using Newton's Law of Gravity and the constants from the textbook, we have F = G M 1 M 2 / r 2 = (6.67x10 -11 N m 2 / kg 2 ) (1.99x10 30 kg) (7.36x10 22 kg) / (1.50x10 11 m) 2 = F = 4.34x10 20 N . b.) What is the gravitational force of attraction between two students sitting 2.00m apart? Assume they both have a mass of 65.0kg . Using Newton's Law of Gravity we have F = G M 1 M 2 / r 2 = (6.67x10 -11 N m 2 / kg 2 ) (65.0kg) (65.0kg) / (2.00m) 2 = F = 7.05x10 -8 N . 2. A 25.0kg crate rests on the back end of a flat-bed truck. The coefficient of static friction between the crate and the bed is μ s = 0.142 .

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## HW07Sol(2) - Jim Guinns PHYS2211 Assignment #7 Solutions...

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