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A projectile launched at 20 m/s at an angle of 30 o lands on a level surface. How far away does it land?. 40 meters 20 meters 34 meters 9.8 meters 17 meters. 0 of 30. The magnitude of the centripetal acceleration. a c =v/r 2 a c =r/v a c =v 2 /r 2 a c =v 2 /r. 0 of 30.

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  1. A projectile launched at 20 m/s at an angle of 30o lands on a level surface. How far away does it land? • 40 meters • 20 meters • 34 meters • 9.8 meters • 17 meters 0 of 30

  2. The magnitude of the centripetal acceleration. • ac=v/r2 • ac=r/v • ac=v2/r2 • ac=v2/r 0 of 30

  3. The acceleration of an object in uniform circular motion: • Is zero • Points outward • Points to the center • Points in the direction the object is moving 0 of 30

  4. A push or a pull • Acceleration • Pressure • Force • Mass 0 of 30

  5. Forces are measured in: • Newtons • Kilograms • Pascals • m/s2 0 of 30

  6. On earth the force of gravity acting on a 4.5 kg object is • 0.45 N • 4.5 kg • 45 N • 450 N 0 of 30

  7. What is the mass of an 18 kg object on earth? • 1.8 kg • 1.8 N • 18 kg • 180 N 0 of 30

  8. If a 2.0 kg textbook were taken to the moon its mass there would be: • Significantly smaller than on earth. • Zero • Still 2.0 kg • Significantly larger than on earth 0 of 30

  9. Which of the following is NOT a fundamental force of nature? • Weak Nuclear Force • Electromagnetic Force • Friction Force • Gravitational force 0 of 30

  10. Newton’s first law states: • Moving things tend to slow down and stop if not acted on by a force. • Constant velocity motion is only possible if no forces act on an object. • This go in a straight line at constant speed when the net force is zero. 0 of 30

  11. Tendency of an object to continue moving like it already was. • Density • Power • Force • Inertia 0 of 30

  12. Things have more inertia if they have a greater: • Density • Volume • Mass • Free fall acceleration 0 of 30

  13. Micro (m) • x10-9 • x10-6 • x10+3 • x10+12 0 of 30

  14. A ball is thrown straight up. At its highest point its velocity is ____ and its acceleration is _____ • 0, 0 • 0, 10 m/s2 down • 10 m/s, 0 • 10 m/s, 10 m/s2 up 0 of 30

  15. A 5.0 kg object experiences a forward force of 20.0 N and a backwards force of 5 N. The net force is: • 50 N • 25 N • 75 N • 15 N 0 of 30

  16. A 5.0 kg object experiences a forward force of 20.0 N and a backwards force of 5 N. The acceleration is: • 9.8 m/s2 • 5.0 m/s2 • 3.0 m/s2 • 0.67 m/s2 0 of 30

  17. If the frictional force is 40 N and the normal force is 200 N the frictional coefficient is: • 5.0 • 0.5 • 0.4 • 0.2 0 of 30

  18. A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the floor. The net force is____. • 35 N • 20 N • 5.0 N • 0.0 N 0 of 30

  19. A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the floor. The frictional force is____. • 35 N • 30 N • 10 N • 0 N 0 of 30

  20. A horizontal force of 35 N causes a 2.0 kg object to accelerate at 2.5 m/s2 across the floor. The coefficient of friction is____. • 1.5 • 0.67 • 0.20 • 0.10 0 of 30

  21. On earth 1.0 kg weighs • 2.2 lbs • 0.1 N • 1.0 kg • 2.54 lbs 0 of 30

  22. If 2.0 kg weighs 8.0 N on the surface of a planet, the acceleration of a dropped object would be: • 10 m/s2 • Depends on the mass • 16 m/s2 • 4.0 m/s2 0 of 30

  23. Equal to kg∙m/s2. • Liters • Mph • Newtons • Watts 0 of 30

  24. If a 140 kg football player collides with an opponent who is only 60 kg which player exerts a larger force? • The 140 kg player • The 60 kg player • The forces are equal in magnitude 0 of 30

  25. An object will fall at constant speed • Once air resistance exerts a force equal to the weight of the object • Only on the moon • Only if it has a parachute or a propeller. • Only if there is no gravity 0 of 30

  26. A 6.0 kg object traveling at 5.0 m/s strikes a 2.0 kg object that is initially at rest. What is the total momentum following the collision? • 11 kg m/s • 75 kg m/s • 30 kg m/s • Can not be determined 0 of 30

  27. A solid block of metal measures 5 cm x 6 cm x 10 cm and has a mass of 1.8 kg. The density of the metal is: • 3.0 g/cm3 • 300 g/cm3 • 6.0 g/cm3 • 1.0 g/cm3 0 of 30

  28. Kepler determined that planets travel in ________ orbits. • Circular • Elliptical • Parabolic • Linear 0 of 30

  29. Demonstrated that objects on earth experience a gravitational attraction? • Kepler • Newton • Galileo • Cavendish 0 of 30

  30. Formulated three laws of planetary motion: • Galileo • Einstein • Kepler • Newton 0 of 30

  31. What is the acceleration of a car going around a 100 m radius turn at a constant speed of 20 m/s? • 0 m/s2 • 10 m/s2 • 0.20 m/2 • 4.0 m/s2 0 of 30

  32. A 6.0 kg object traveling at 5.0 m/s strikes a 2.0 kg object that is initially at rest. If the objects stick together, what is their speed following the collision? • 5.0 m/s • 3.75 m/s • 2.5 m/s • 0.0 m/s 0 of 30

  33. A ball that is thrown straight up at 20 m/s reaches a maximum height of • 10 m • 20 m • 40 m • 80 m 0 of 30

  34. What is the momentum of a 6.0 kg object traveling at 5.0 m/s? • 11 kg m/s • 75 kg m/s • 30 kg m/s • 1.2 kg m/s 0 of 30

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