# HW07 - Consider this diagram for Problems 3 and 4 For all...

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Jim Guinn’s PHYS2211 Assignment #7 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.) b.) What is the gravitational force of attraction between two students sitting 2.00m apart? Assume they both have a mass of 65.0kg . 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 . a.) What is the maximum force of static friction that the truck's bed can exert on the crate? b.) What is the maximum acceleration the static friction can cause the crate to have? c.) If the truck accelerates from rest to 30.0km/hr in 6.00s , what will happen to the crate?

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Unformatted text preview: Consider this diagram for Problems 3 and 4. For all of the questions, just give the magnitudes of the vectors. CRATE 25.0 kg θ m μ s , μ k 3. In the diagram let m = 35.0kg , θ = 10.0 o , μ s = 0.250 , μ k = 0.100 . a.) What is the normal force acting on the block? b.) What is the component of gravity acting down the incline? c.) What is the maximum static frictional force? d.) What is the acceleration of the block? 4. In the diagram let m = 35.0kg , θ = 20.0 o , μ s = 0.250 , μ k = 0.100 . a.) What is the normal force acting on the block? b.) What is the component of gravity acting down the incline? c.) What is the maximum static frictional force? d.) What is the acceleration of the block?...
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