Text exercise questions from Conceptual Physics 11e, physics homework help

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• Ch. 6: Exercises 8 & 20 8. A person can survive a feet first impact at a speed of about 12 m/s (27mi/h) on concrete; 15m/s 34 mi/h) on soil; and 34 m/s (76 mi/h) on water. Why the different values for different surfaces? 20. Why does a baseball catcher’s mitt have more padding than a conventional glove? • Ch. 7: Exercises 14, 36, & 57 14.Explain how “Elastic potential energy” dramatically changed the sport of pole vaulting when flexible fiberglass poles replaced stiffer wooden poles? 36. When the girl in Figure 7.16 jacks up a car, how can applying so little force produce sufficient force to raise the car? 57. An inefficient machine is said to “waste energy”. Does this mean that energy is actually lost? Explain. • Ch. 8: Exercises 18 & 42 Is the net torque changed when a partner on a seesaw stands or hangs from her end instead of sitting? (Does the weight of the lever arm change?) 42. When you are in the front passenger seat of a car turning to the left, you may find yourself presses against the door? Why does the door press on you? Does your explanation involve a centrifugal force, or Newton’s law? • Ch. 9: Exercises 12 & 22 12.An apple falls because of the gravitational attraction to Earth.How does the gravitational attraction of Earth to the apple compare? (Does force change when you interchange m1 and m2 in the equation for gravity---m2m1 instead of m1m2?) 22. The planet Jupiter is more than 300 times as massive as Earth, so it might seem that a body on the surface of Jupiter would weigh 300 times as much as on Earth. But it so happens that a body would scarcely weigh 3 times as much on the surface of Jupiter as it would on the surface of Earth. Can you think of an explanation for why this is so? (Hint: Let the terms in the equation for gravitational force guide your thinking?) • Ch. 10: Exercises 5 & 58 5.A heavy crate accidetnlly falls from a high-flying airplane just as it flies directly above a shiny red Porsche smartly parked in a car lot. Relative to the Porsche, where will the crate crash? 58. At which of the indicated positions does the satellite in elliptical orbit experience the greatest gravitational force? Have the greatest speed? The greatest velocity? The greatest momentum? The greatest kinetic energy? The greatest gravitational potential energy? The greatest total energy? The greatest angular momentum? The greatest acceleration?
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Running head: Answer to physics Question

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8.
Rate of change of momentum is directly proportional to the applied force

Where Δ p= change in momentum
Δ t = period
F applied = force
The force exerted on an object during collision is directly proportional to the rate
of change of momentum. For the same amount change in momentum, the force exerted is
greater if time duration of collision is small. On concrete, the man stops instantly after the
collision, the time duration for the collision is smaller. Therefore, to prevent the legs to be
broken, the changes in momentum should also be small. On soil, the man takes some time
to stop after the collision: the time duration for the collision is greater than in case of
concrete. Therefore, the change in momentum can be greater than that in case of
concrete. Similar, for ...


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