HW12 - 3. Consider three masses, m 1 = 1kg, m 2 = 2kg , and...

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15.0 o Jim Guinn’s PHYS2211 Assignment #12 These problems are NOT to be turned in. They are for your practice to study for the exam. 1. A 15.0kg box slides 2.00m down a ramp that is inclined 17.0 o to the horizontal as in the diagram. There is a coefficient of kinetic friction of 0.120 between the block and the ramp. How much work is done by the gravitational force, the normal force, and friction? (Keep in mind that W = F r cos θ .) 2. A 5.00kg box slides on the floor. The initial speed of the box is 7.50m/s and the coefficient of kinetic friction between the box and the floor is 0.165 . For this problem, use that W total = KE. Do not use F = ma ! a) How fast is the box moving after it has slid for 2.00m ? b) How far will the box slide from its initial point before coming to rest?
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Unformatted text preview: 3. Consider three masses, m 1 = 1kg, m 2 = 2kg , and m 3 = 3kg. At t = 0 , m 1 is at the point (x, y) = (3m, 0) and has a velocity of 2m/s x , m 2 is at the point (x, y) = (0, 2m) and has a velocity 1m/s y , and m 3 is at the point (x, y) = (-2m, 0) and has a velocity of -3m/s y . You may answer these with the components of the vectors. a) What is the total momentum of the system? b) What is the velocity of the center of mass? c) What is the initial location of the center of mass? d) Find the location of the masses at t = 1sec and recalculate the position of the center of mass using those new locations. e) Using your answers from parts c) and d), show that the velocity of the center of mass is the same as what you got from part b)....
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