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Chapter 1: Introduction: The Nature of Science and Physics

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College Physics (Urone)
Pages: 11 - 34

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92 Questions for Chapter 1: Introduction: The Nature of Science and Physics

  1. A real process may be nearly adiabatic if it occurs over a very short time. How does the short time span help the process to be adiabatic?

    Found on Page 11
  2. Does the second law of thermodynamics alter the conservation of energy principle?

    Found on Page 11
  3. add

    Found on Page 11
  4. Explain why heat pumps do not work as well in very cold climates as they do in milder ones. Is the same true of refrigerators?

    Found on Page 11
  5. Calculate the approximate number of atoms in a bacterium. Assume that the average mass of an atom in the bacterium is ten times the mass of a hydrogen atom. (Hint: The mass of a hydrogen atom is on the order of 10-27kg and the mass of a bacterium is on the order of 10-15kg.)

    Found on Page 11
  6. Conversations with astronauts on the lunar surface were characterized by a kind of echo in which the earthbound person’s voice was so loud in the astronaut’s space helmet that it was picked up by the astronaut’s microphone and transmitted back to Earth. It is reasonable to assume that the echo time equals the time necessary for the radio wave to travel from the Earth to the Moon and back (that is, neglecting any time delays in the electronic equipment). Calculate the distance from Earth to the Moon given that the echo time was 2.56 s and that radio waves travel at the speed of light (\({\bf{3 \times 1}}{{\bf{0}}^{\bf{8}}}\;{\bf{m/s}}\)).

    Found on Page 11
  7. (a) Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium. (b) Making the same assumption, how many cells are there in a human?

    Found on Page 11
  8. Assuming one nerve impulse must end before another can begin, what is the maximum firing rate of a nerve in impulses per second?

    Found on Page 11
  9. A ball is thrown straight up. It passes a 2.00 m highwindow 7.50 moff the ground on its path up and takes 1.30sto go past the window. What was the ball’s initial velocity?

    Found on Page 11
  10. Using approximate values, calculate the slope of the curve in Figure 2.62 to verify that the velocity at t= 30 sec is 0.238 m/s. Assume all values are known to 3 significant figures

    Found on Page 11

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