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Chapter 7: Energy of a System

Physics For Scientists & Engineers
Pages: 177 - 210

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43 Questions for Chapter 7: Energy of a System

  1. An ice cube has been given a push and slides without friction on a level table. Which is correct? (a) It is in stable equilibrium. (b) It is in unstable equilibrium. (c) It is in neutral equilibrium. (d) It is not in equilibrium.

    Found on Page 177
  2. In a control system, an accelerometer consists of a 4.7 g object sliding on a calibrated horizontal rail. A low-mass spring attaches the object to a flange at one end of the rail. Grease on the rail makes static friction negligible, but rapidly damps out vibrations of the sliding object. When subject to a steady acceleration of

    Found on Page 177
  3. The record number of boat lifts, including the boat and its ten crew members, was achieved by Sami Heinonen and Juha Räsänen of Sweden in 2000. They lifted a total mass of 653.2Kg approximately 4 Inches off the ground a total of 24 times. Estimate the total work done by the two men on the boat in this record lift, ignoring the negative work done by the men when they lowered the boat back to the ground.

    Found on Page 177
  4. A particle moves along the x axis from x = 12.8 m to x = 23.7 m under the influence of a forceF=375x3+3.75x where F is in newtons and x is in meters. Using numerical integration, determine the work done by this force on the particle during this displacement. Your result should be accurate to within 2%.

    Found on Page 177
  5. You are re-shelving books in a library. You lift a book from the floor to the top shelf. The kinetic energy of the book on the floor was zero and the kinetic energy of the book on the top shelf is zero, so no change occurs in the kinetic energy, yet you did some work in lifting the book. Is the work–kinetic energy theorem violated? Explain.

    Found on Page 204
  6. Figure OQ7.10 shows a light extended spring exerting a force to the left on a block. (i) Does the block exert a force on the spring? Choose every correct answer. (a) No, it doesn’t. (b) Yes, it does, to the left. (c) Yes, it does, to the right. (d) Yes, it does, and its magnitude is larger than Fs. (e) Yes, it does, and its magnitude is equal to Fs. (ii) Does the spring exert a force on the wall? Choose your answers from the same list (a) through (e)

    Found on Page 177
  7. If the speed of a particle is doubled, what happens to its kinetic energy? (a) It becomes four times larger. (b) It becomes two times larger. (c) It becomes 2 times larger. (d) It is unchanged. (e) It becomes half as large.

    Found on Page 177
  8. A force F→=(6i^-2j^)Nacts on a particle that undergoes a displacement Δr→=(3i^+j^)m. Find

    Found on Page 205
  9. Mark and David are loading identical cement blocks onto David’s pickup truck. Mark lifts his block straight up from the ground to the truck, whereas David slides his block up a ramp containing frictionless rollers. Which statement is true about the work done on the block–Earth system? (a) Mark does more work than David. (b) Mark and David do the same amount of work. (c) David does more work than Mark. (d) None of those statements is necessarily true because the angle of the incline is unknown. (e) None of those statements is necessarily true because the mass of one block is not given.

    Found on Page 177
  10. Using the definition of the scalar product, find the angles between

    Found on Page 205

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