Midterm Review Packet

Overall though the concepts and set up are the same

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Overall though, the concepts and set up are the same. Going through old notes/HW’s might help you study. 27) A person of mass 60 kg is 3 m from another person whose mass is 80 kg. What is the gravitational force between them? 3.56x10 -8 N 28) A communications satellite orbits the Earth at an altitude of 35,000km above the Earth’s surface. Mass Earth= 6x10 24 6 m. What is the satellite’s velocity? 3,109.13m/s 29) Mass of Pluto is 1.25x10 22 kg and has a radius of 1.195x10 6 meters. What is the acceleration due to gravity on Pluto’s surface? 0.58m/s 2 WORK, ENERGY, AND POWER : 30) A horizontal 300N force pushes a 40kg object over 10 meters of a frictionless and horizontal surface. After this, the block slides up a 20° incline. Assuming the incline has a coefficient of kinetic friction of 0.4, how far along the incline with the object slide? 10.66m 31) The two blocks are released from rest. After the 60 kg mass on the left moves down a distance of 3 m, it is traveling at 1.25 m/s. What is the unknown mass on the right if they are starting from the same height? 56.9 kg 32) A 6kg block is at rest against a spring that has a constant of 1,750N/m. The spring is initially compressed 0.3m. When the block is released, it slides along a horizontal surface that has a coefficient of kinetic friction of 0.12 for 3m. The block then goes up a 12º incline where it comes to a stop after traveling 4.5m along the incline. What is the coefficient of kinetic friction between the block and the incline? 0.0099 33) A 2,500 kg elevator is lifted from rest to a height of 5 m where it is moving at 3 m/s. If the time required to lift the elevator is 8 s, what is the power output of the motor that pulls on the cable which then pulls on the elevator. 16,718.75 W IMPULSE AND MOMENTUM ; 1) A 2000kg car traveling right at 20m/s has a perfectly inelastic collision with a car traveling left at 35 m/s. After the collision, they travel to the right at 5 m/s. What is the mass of the other car? 750 kg 2) A pool cue ball, mass 0.7 kg, is traveling at 2 m/s when it collides head on with another ball, mass 0.5 kg, traveling in the opposite direction with a speed of 1.2 m/s. After the collision, the cue ball travels in the opposite direction at 0.3 m/s. What is the velocity of the other ball? 2.02 m/s 3) A 1000kg car is traveling east at 20m/s when it collides inelastically with a northbound 2000kg car traveling at 15m/s. If the coefficient of kinetic friction is 0.9, how far do the two cars skid before coming to a stop? Also, what angle do they travel at? 8.19m, 56.3º 4) A cue ball, mass 1kg, travels horizontally and collides with a stationary billiard ball, mass 0.8 kg. After the collision the cue ball travels backwards at an angle of 30º above the horizontal. The other billiard ball travels at a speed of 8 m/s at an angle of 20º below the horizontal. What is the initial velocity of the cue ball? 2.22m/s
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