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Physics Midterm Review These are a few sample questions! Be sure to also study all of your notes. Be sure to review the following: Physics Vocabulary & Conversions One-Dimensional Motion Two-Dimensional Motion Forces (including Centripetal Force) 1. Jennifer walks 65 meters west and stops. She then turns around and heads east for 20 meters. What is her displacement? (45 m) 2. A car accelerates from rest to a speed of 35 miles an hour in only 6 seconds. What is the acceleration? (2.6 m/s 2) 3. How long will it take an object accelerating from 20 m/s at a rate of 7 m/s2 to reach a speed of 65 m/s? (6.4 sec) 4. A ball is thrown horizontally from a point 50 m above the ground. How long was the ball in the air? (3.2 sec) 5. A missile launches at a velocity of 45.0 m/s at an angle of 17.0° to the horizontal. What is the maximum height the missile attains? (8.5 m) 6. A 3 kg box is pushed on a horizontal surface. It moves on the surface with an acceleration of 0.27 m/s 2. Calculate the applied force that must be acting on the box. (0.81 N) 7. A sign with a mass of 250 kg hangs by a single rope. What is the tension in the string? (2,450 N) 8. A 1,150 kg car is parked on a street with an incline of 2.5. What is the frictional force needed to keep the car in place? (492 N) 9. Using the information in #8, determine the coefficient of friction. (0.044) 10. Using the information in #8, calculate the acceleration of the car if the frictional force was cut in half. (0.21 m/s/s) 11. A projectile is launched off a 25 m tall cliff with a velocity of 16 m/s at an angle of 32° from the horizontal. Determine how long the projectile is in air and where it will land. (3.3 seconds, 45 m) 12. You are pushing an 8 kg box at a constant speed across a horizontal surface. You push with a force of 12 N which makes an angle of 36° with the horizontal. Determine the coefficient of friction. (0.11) 13. Using the information in #12, determine the acceleration of the stroller if the coefficient of friction was half. (0.63 m/s/s)