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Chapter 7: Kinetic Energy and Work

Fundamentals Of Physics
Pages: 149 - 176

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82 Questions for Chapter 7: Kinetic Energy and Work

  1. A coin slides over a frictionless plane and across an xy coordinate system from the origin to a point with xy coordinates (3.0m,4.0m) while a constant force acts on it. The force has magnitude 2.0 Nand is directed at a counterclockwise angle of100° from the positive direction of the x axis. How much work is done by the force on the coin during the displacement?

    Found on Page 171
  2. A 12.0 Nforce with a fixed orientation does work on a particle as the particle moves through the three-dimensional displacement d→=(2.00i^-4.00j^+30.0k^). What is the angle between the force and the displacement if the change in the particle’s kinetic energy is (a) +30.0 J and (b) -30.0 J ?

    Found on Page 171
  3. A can of bolts and nuts is pushed 2.00 m along an x axis by a broom along the greasy (frictionless) floor of a car repair shop in a version of shuffleboard. Figure 7-26 gives the work Wdone on the can by the constant horizontal force from the broom, versus the can’s position x. The scale of the figure’s vertical axis is set by WS=6 J. (a) What is the magnitude of that force? (b) If the can had an initial kinetic energy of 3.00 J, moving in the positive direction of the x axis, what is its kinetic energy at the end of the 2.00 m?

    Found on Page 171
  4. A luge and its rider, with a total mass of 85 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 37 m/s. If a force slows them to a stop at a constant rate of 2.0 m/s2, (a) what magnitude F is required for the force, (b) what distance d do they travel while slowing, and (c) what work W is done on them by the force? What are (d) f , (e) d , and (f) W if they, instead, slow at 4.0 m/s2 ?

    Found on Page 171
  5. Figure 7-27 shows an overhead view of three horizontal forces acting on a cargo canister that was initially stationary but now moves across a frictionless floor. The force magnitudes are F1=3.00N, F2=4.00N, and F3=10.00N, and the indicated angles are θ2=50.0°and θ3=35.0°. What is the net work done on the canister by the three forces during the first 4.00 m of displacement?

    Found on Page 171
  6. Figure 7-28shows three forces applied to a trunk that moves leftward by 3.00 m over a frictionless floor. The force magnitudes are F1=5.00N, F2=9.00N, and F3=3.00N, and the indicated angle is θ=60.0°. During the displacement, (a) what is the net work done on the trunk by the three forces and (b) does the kinetic energy of the trunk increase or decrease?

    Found on Page 171
  7. (a) In 1975 the roof of Montreal’s Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift? (b) In 1960 a Tampa, Florida, mother reportedly raised one end of a car that had fallen onto her son when a jack failed. If her panic lift effectively raised 4000 N (about of the car’s weight) by 5.0 cm, how much work did her force do on the car?

    Found on Page 172
  8. A proton (massm=1.67×10-27kg)is being accelerated along a straight line at 3.6×1015m/s2in a machine. If the proton has an initial speed of 2.4×107m/sand travels 3.5 cm, what then is (a) its speed and (b) the increase in its kinetic energy?

    Found on Page 170
  9. If a Saturn V rocket with an Apollo spacecraft attached had a combined mass of 2.9×105kgand reached a speed of 11.2km/s, how much kinetic energy would it then have?

    Found on Page 170
  10. A 5.0 kg block moves in a straight line on a horizontal frictionless surface under the influence of a force that varies with position as shown in Fig.7-39. The scale of the figure’s vertical axis is set byFs=10.0N. How much work is done by the force as the block moves from the origin to x=8.0cm?

    Found on Page 173

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