Concept Check #6: Name: Please show all work in order to get full credit. This includes...
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Concept Check #6: Name: Please show all work in order to get full credit. This includes equation used, numbers plugged in, and answers. Final answers must include direction if needed. Momentum and Impulse: 1. What is the momentum of a 12 kg dog running at the velocity of 23.5 m/s, North? (1 point) 2. What is the impulse of a 60.0 N force that acts on an object for 0.14 s? (1 point) 3. A 450 g soccer ball is kicked with a force that lasted for 0.75s. From that kick, the soccer ball had at a velocity of 9.1 m/s, forward. What was the force that kicked the soccer ball? (2 points) Conservation of momentum: 4. A 25 kg dog runs to the east with a speed of 4.5 m/s and jumps on a skateboard (crazy little dog). The skateboard and dog travel at a speed of 3.1 m/s to the east. What is the mass of the skateboard? Is this an elastic or inelastic collision? (3 points) 5. A 150 kg red bumper car is traveling to the right with a velocity of 3.3 m/s and collides into a blue bumper car with mass of 225 kg moving in the opposite direction with a speed of 2.9 m/s. After the collision, the red bumper car moves with a velocity of 1.4 m/s to the left. What is the velocity of the blue bumper car after the collision? What type of collision is this? (3 points) Static Equilibrium and Torque: 6. A force of 9.1 N is applied to a door at an angle of 73 and a distance of 0.85 m from the hinge. What is the torque produced? (2 point) 7. Two kids sit on a teeter totter. The length of the teeter totter is 12 m long. The 35 kg kid sits 5.0 m from the center. Where does the 42 kg kid need to sit to balance the teeter totter? (2 points) Angular Rotation: Use angular kinematics. 8. A record player spins 1250 rpm (rev/min). If it starts from rest and has an acceleration of 185 r/s (rad/s), how long does it take for the player to get to full speed? (2 points) 9. A ceiling fan rotates with an angular speed of 115 rotations per minute. When you turn the fan off, it takes 35.0 rev to come to a stop with a constant acceleration. What is the magnitude of the angular acceleration in rad/s. How long did it take the fan to come to a complete stop? (4 points) Concept Check #6: Name: Please show all work in order to get full credit. This includes equation used, numbers plugged in, and answers. Final answers must include direction if needed. Momentum and Impulse: 1. What is the momentum of a 12 kg dog running at the velocity of 23.5 m/s, North? (1 point) 2. What is the impulse of a 60.0 N force that acts on an object for 0.14 s? (1 point) 3. A 450 g soccer ball is kicked with a force that lasted for 0.75s. From that kick, the soccer ball had at a velocity of 9.1 m/s, forward. What was the force that kicked the soccer ball? (2 points) Conservation of momentum: 4. A 25 kg dog runs to the east with a speed of 4.5 m/s and jumps on a skateboard (crazy little dog). The skateboard and dog travel at a speed of 3.1 m/s to the east. What is the mass of the skateboard? Is this an elastic or inelastic collision? (3 points) 5. A 150 kg red bumper car is traveling to the right with a velocity of 3.3 m/s and collides into a blue bumper car with mass of 225 kg moving in the opposite direction with a speed of 2.9 m/s. After the collision, the red bumper car moves with a velocity of 1.4 m/s to the left. What is the velocity of the blue bumper car after the collision? What type of collision is this? (3 points) Static Equilibrium and Torque: 6. A force of 9.1 N is applied to a door at an angle of 73 and a distance of 0.85 m from the hinge. What is the torque produced? (2 point) 7. Two kids sit on a teeter totter. The length of the teeter totter is 12 m long. The 35 kg kid sits 5.0 m from the center. Where does the 42 kg kid need to sit to balance the teeter totter? (2 points) Angular Rotation: Use angular kinematics. 8. A record player spins 1250 rpm (rev/min). If it starts from rest and has an acceleration of 185 r/s (rad/s), how long does it take for the player to get to full speed? (2 points) 9. A ceiling fan rotates with an angular speed of 115 rotations per minute. When you turn the fan off, it takes 35.0 rev to come to a stop with a constant acceleration. What is the magnitude of the angular acceleration in rad/s. How long did it take the fan to come to a complete stop? (4 points)
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The momentum of an object is given by the product of its mass and velocity In this case the mass of the dog is 12 kg and its velocity is 235 ms north Therefore the momentum can be calculated as Moment... View the full answer
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7th Edition
Authors: Mark S Beasley, Frank A. Buckless, Steven M. Glover, Douglas F Prawitt
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