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PHYS172

# PHYS172 - 1 10/10 points(a In outer space far from other...

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1. 10/10 points (a) In outer space, far from other objects, block 1 of mass 40 kg is at position < 6 , 5 , 0 > m, and block 2 of mass 1300 kg is at position < 15 , 5 , 0 > m. What is the (vector) gravitational force acting on block 2 due to block 1? It helps to make a sketch of the situation. grav = < -4.301e-8 [-4.30e-08] , 0 [0] , 0 [0] > N (b) At 4.6 seconds after noon both blocks were at rest at the positions given above. At 4.9 seconds after noon, what is the (vector) momentum of block 2? 1 = < -1.2903e-8 [-1.29e-08] , 0 [0] , 0 [0] > kg·m/s (c) At 4.9 seconds after noon, what is the (vector) momentum of block 1? 2 = < 1.2903e-8 [1.29e-08] , 0 [0] , 0 [0] > kg·m/s At 4.9 seconds after noon, which one of the following statements is true? (_) (_) Block 1 and block 2 have the same speed. (o) (o) Block 1 is moving faster than block 2. (_) (_) Block 2 is moving faster than block 1. 2. 17/17 points (a)Two thin hollow plastic spheres, about the size of a ping-pong ball with masses (m 1 =m 2 = 2 e-3 kg) have been rubbed with wool. Sphere 1 has a charge q 1 = -8 e-9 C and is at location < 50 e-2, -20 e-2, 0 > m. Sphere 2 has a charge q 2 = -5 e-9 C and is at location <

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