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Chapter 6: The Energy Principle

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Matter & Interactions
Pages: 215 - 283
Matter & Interactions

Matter & Interactions

Book edition 4th edition
Author(s) Ruth W. Chabay, Bruce A. Sherwood
Pages 1135 pages
ISBN 9781118875865

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Illustration

81 Questions for Chapter 6: The Energy Principle

  1. This problem is closely related to the spectacular impact of the comet Shoemaker-Levy with Jupiter in July 1994:

    Found on Page 280

  2. A pitcher can throw a baseball at about100mi/h(about44m/s). What is the ratio of the kinetic energy to the rest energy mc2?

    Found on Page 248

  3. A pitcher can throw a baseball at about 100mi/h(about44m/s). What is the ratio of the kinetic energy to the rest energy role="math" localid="1657706011431" mc2?

    Found on Page 276

  4. Suppose that you throw a ball at an angle to the horizontal, and just after it leaves your hand at a height yiits velocity isvxi,vyi,0. Assuming that we can neglect air resistance, at the top of its trajectory, when it is momentarily traveling horizontally, its velocity isvxi,0,0. What is the heightyfat the top of the trajectory, in terms of the other known quantities? Use the Energy Principle.

    Found on Page 215

  5. What is the speed of an electron whose total energy is equal to the total energy of a proton that is at rest? What is the kinetic energy of this electron?

    Found on Page 276

  6. Two protons are hurled straight at each other, each with a kinetic energy of 0.1MeV. You are asked to calculate the separation between the protons when they finally come to a stop. Write out the Energy Principle for this system, using the update form and including all relevant terms.

    Found on Page 250

  7. The point of this question is to compare rest energy and kinetic energy at low speeds. A baseball is moving at a speed of 17m/s. Its mass is 145g(0.145kg). (a) What is its rest energy? (b) Is it okay to calculate its kinetic energy using the expressionrole="math" localid="1657713286046" 12mv2? (c) What is its kinetic energy? (d) Which is true? A. the kinetic energy is approximately equal to the rest energy. B. the kinetic energy is much bigger than the rest energy. C. the kinetic energy is much smaller than the rest energy.

    Found on Page 276

  8. Throw a ball straight up and catch it on the way down, at the same height. Taking into account air resistance, does the ball take longer to go up or to come down? Why?

    Found on Page 215

  9. The point of this question is to compare rest energy and kinetic energy at high speeds. An alpha particle (a helium nucleus) is moving at a speed of 0.9993times the speed of light. Its mass is 6.40×10-27kg(a) what is its rest energy? (b) Is it okay to calculate its kinetic energy using the expressionK-12mv2?(c) What is its kinetic energy? (d) Which is true? A. the kinetic energy is approximately equal to the rest energy. B. The kinetic energy is much bigger than the rest energy. C. The kinetic energy is much smaller than the rest energy.

    Found on Page 276

  10. In the given figure what kind of motion is represented by the situation with K + U = A? B? C?Think about the range of rin each situation, For example, Crepresents a circular orbit (constant r).

    Found on Page 253

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