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Chapter 3: The Fundamental Interactions

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Matter & Interactions
Pages: 88 - 129
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

70 Questions for Chapter 3: The Fundamental Interactions

  1. A proton and an electron are separated by 1×10-10m the radius of a typical atom. Calculate the magnitude of the electric force that the proton exerts on the electron and the magnitude of the electric force that the electron exerts on the proton.

    Found on Page 125

  2. Two thin hollow plastic spheres, about the size of a ping-pong ball with masses (m1=m2=2×10-3kg), have been rubbed with wool. Sphere 1 has a charge of q1=-2×10-9Cand is at location (0.50,-0.20,0). Sphere 2 has a charge of q2=-4×10-9Cand is atlocation (-0.40,0.40,0). It will be useful to draw a diagram of the situation, including the relevant vectors.

    Found on Page 125

  3. A satellite that is spinning clockwise has four low-mass solar panels sticking out as shown. A tiny meteor traveling at high speed rips through one of the solar panels and continues in the same direction but at reduced speed. Afterward, calculate the vxandvycomponents of the center of mass velocity of the satellite. In Figure 3.64 v1→andv2→ are the initial and final velocities of the meteor, andv→ is the initial velocity of the center of the mass of the satellite, in the x-direction.

    Found on Page 127

  4. A space station has the form of a hoop of radius R, with mass M. Initially its center of mass is not moving, but it is spinning. Then a small package of mass m is thrown by a spring-loaded gun toward a nearby spacecraft as shown in Figure 3.66; the package has a speed v after launch. Calculate the center-of-mass velocity (a vector) of the space station after the launch.

    Found on Page 127

  5. Suppose that all the people of the Earth go to the North Pole and, on a signal, all jump straight up. Estimate the recoil speed of the Earth. The mass of the Earth is 6×1024kg, and there are about 6 billion people (6×109).

    Found on Page 128

  6. Which fundamental interaction (gravitational, electromagnetic, strong, or weak) is responsible for each of these processes? How do you know? (a) A neutron outside a nucleus decays into a proton, electron, and antineutrino. (b) Protons and neutrons attract each other in a nucleus. (c) The Earth pulls on the Moon. (d) Protons in a nucleus repel each other.

    Found on Page 123

  7. At a particular instant the magnitude of the gravitational force exerted by a planet on one of its moons is 3×1023N. If the mass of the moon were three times as large, what would be the magnitude of the force? If instead the distance between the moon and the planet were three times as large (no change in mass), what would be the magnitude of the force?

    Found on Page 123

  8. Masses Mand m attract each other with a gravitational force of magnitude F. Mass m is replaced with a mass 3m, and it is moved four times farther away. Now, what is the magnitude of the force?

    Found on Page 123

  9. A planet of mass 4×1024 kg is at location〈5e11,−2e11,0〉 m. A star of mass 5×1050 kg is at location〈−2e11,3e11,0〉 m. It will be useful to draw a diagram of the situation, including the relevant vectors.

    Found on Page 124

  10. Astar exerts a gravitational force of magnitude 4×1025 Non a planet. (a) What is the magnitude of the gravitational force that the planet exerts on the star? (b) If the mass of the planet were twice as large, what would be the magnitude of the gravitational force on the planet? (c)If the distance between the star and planet (with their original masses) were three times larger, what would be the magnitude of this force?

    Found on Page 91

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