Explanation Given: A 20 g particle is moving to the left at 30 m/s. A force on the particle causes it to move right at 30 m/s. Formula used: Work done by force = Change in Kinetic Energy Calculation: Let v i be the initial velocity = - 30 m/s v f be the final velocity = + 30 m/s Change in Kinetic Energy = 0.5 × m × ( v f 2 − v i 2 ) = 0

4th Edition

ISBN: 9780135245033

Author: Knight

Publisher: PEARSON

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Instantaneous Power

Power is defined in physics as the amount of energy transmitted or transformed per unit time. The watt is the unit of electricity in the International System of Units, equivalent to one joule per second.

Question

Chapter 9, Problem 7EAP

To determine

The amount of work done by the force.

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Chapter 9, Problem 6EAP

Chapter 9, Problem 8EAP

Chapter 9 Solutions

MASTERPHYS:KNIGHT'S PHYSICS ACCESS+WKB

Ch. 9 - If a particle’s speed increases by a factor of 3,...Ch. 9 - Prob. 2CQ Ch. 9 - 3. An elevator held by a single cable is ascending...Ch. 9 - The rope in FIGURE Q9.4 pulls the box to the left...Ch. 9 - 5. A 0.2 kg plastic cart and a 20 kg lead cart...Ch. 9 - A particle moving to the left is slowed by a force...Ch. 9 - 7. A particle moves in a vertical plane along the...Ch. 9 - 8. You need to raise a heavy block by pulling it...Ch. 9 - 9. A ball on a string travels once around a circle...Ch. 9 - A sprinter accelerates from rest. Is the work done...

Ch. 9 - 11. A Spring has an unstretched length of 10cm. It...Ch. 9 - 12. The left end of a spring is attached to a...Ch. 9 - The driver of a car traveling at 60 mph slams on...Ch. 9 - Prob. 14CQ Ch. 9 - Which has the larger kinetic energy, a 10 g bullet...Ch. 9 - At what speed does a 1000 kg compact car have the...Ch. 9 - 3. A mother has four times the mass of her young...Ch. 9 - 4. A horizontal rope with 15 N tension drags a 25...Ch. 9 - 5. A 25 kg box sliding to the left across a...Ch. 9 - A 2.0 kg book is lying on a 0.75-m-high table. You...Ch. 9 - Prob. 7EAP Ch. 9 - Prob. 8EAP Ch. 9 - 9. You throw a 5.5 g coin straight down at 4.0 m/s...Ch. 9 - Prob. 10EAP Ch. 9 - 12. Evaluate the dot product if and . and . Ch. 9 - 12. Evaluate the dot product if and . and . Ch. 9 - 13. What is the angle ? between vectors and in...Ch. 9 - Prob. 14EAP Ch. 9 - Prob. 15EAP Ch. 9 - 16. A 25 kg air compressor is dragged up a rough...Ch. 9 - Prob. 17EAP Ch. 9 - The two ropes seen in FIGURE EX9.18 are used to...Ch. 9 - 19. The three ropes shown in the bird’s-eye view...Ch. 9 - Prob. 20EAP Ch. 9 - Prob. 21EAP Ch. 9 - Prob. 22EAP Ch. 9 - A particle moving on the x-axis experiences a...Ch. 9 - Prob. 24EAP Ch. 9 - A horizontal spring with spring constant 750 N/m...Ch. 9 - 26. A 35-cm-long vertical spring has one end fixed...Ch. 9 - A 10-cm-long spring is attached to the ceiling....Ch. 9 - A 60 kg student is standing atop a spring in an...Ch. 9 - 29. A 5.0 kg mass hanging from a spring scale is...Ch. 9 - A horizontal spring with spring constant 85 N/m...Ch. 9 - 31. One mole (6.02 × 1023 atoms) of helium atoms...Ch. 9 - 32. A 55 kg softball player slides into second...Ch. 9 - A baggage handler throws a 15 kg suitcase along...Ch. 9 - 34. An 8.0 kg crate is pulled 5.0 m up a 30°...Ch. 9 - Justin, with a mass of 30 kg, is going down an...Ch. 9 - Prob. 36EAP Ch. 9 - Prob. 37EAP Ch. 9 - 38. How much energy is consumed by (a) a 1.2 kW...Ch. 9 - 39. At midday, solar energy strikes the earth with...Ch. 9 - Prob. 40EAP Ch. 9 - Prob. 41EAP Ch. 9 - Prob. 42EAP Ch. 9 - 43. A 1000 kg elevator accelerates upward at 1.0...Ch. 9 - 44. a. Starting from rest, a crate of mass m is...Ch. 9 - Prob. 45EAP Ch. 9 - 46. A particle of mass m moving along the x-axis...Ch. 9 - 47. A ball shot straight up with kinetic energy...Ch. 9 - 48. A pile driver lifts a 250 kg weight and then...Ch. 9 - Prob. 49EAP Ch. 9 - 50. You’re fishing from a tall pier and have...Ch. 9 - Hook’s law describes an ideal spring. Many real...Ch. 9 - 52. The force acting on a particle is Fx =...Ch. 9 - 53. The gravitational attraction between two...Ch. 9 - 54. An electric dipole consists of two equal...Ch. 9 - Prob. 55EAP Ch. 9 - 56. When a 65 kg cheerleader stands on a...Ch. 9 - Prob. 57EAP Ch. 9 - Prob. 58EAP Ch. 9 - 59. A horizontal spring with spring constant 250...Ch. 9 - 60. A 90 kg firefighter needs to climb the stairs...Ch. 9 - Prob. 61EAP Ch. 9 - 62. When you ride a bicycle at constant speed,...Ch. 9 - 63. A farmer uses a tractor to pull a 150 kg...Ch. 9 - Prob. 64EAP Ch. 9 - Prob. 65EAP Ch. 9 - Prob. 66EAP Ch. 9 - In problems 67 through 69 you are given the...Ch. 9 - Prob. 68EAP Ch. 9 - Prob. 69EAP Ch. 9 - Prob. 70EAP Ch. 9 - Prob. 71EAP Ch. 9 - Prob. 72EAP

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