College Physics by Eugenia Etkina, Michael Gentile, Alan Van Heuvelen | 9780321715357 | 321715357 | Holooly

College Physics

306 SOLVED PROBLEMS

Question: 2.CE.1

Force diagram for a book Book A sits on a table with book B on top of it. Construct a force diagram for book A. ...

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Sketch and translate We sketch the situatio...

Question: 28.5

How long will the Sun shine? According to the present models of stellar structure, the central parts of stars, which contain about 10% of the star’s mass, have conditions favorable for fusion. Assuming the Sun is made of pure hydrogen, how much time will it take the Sun to radiate the energy ...

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Solve and evaluate Setting the above two expr...

Question: 28.QE.4

Fusion energy in the Sun The energy released by the Sun comes from several sources, including the so-called proton-proton chain of fusion reactions. This chain of reactions can be summarized as follows: 2 ^1 1 H + 2 ^1 0 n S ^4 2 He + energy Determine the energy released in this chain of reactions in ...

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Solve and evaluate Inserting the appropriate v...

Question: 7.2

A painter on a ladder A 75-kg painter stands on a 6.0-m-long 20-kg ladder tilted at 53° relative to the ground. He stands with his feet 2.4 m up the ladder. Determine the torque produced by the normal force exerted by the painter on the ladder for two choices of axis of rotation: (a) an axis ...

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Solve and evaluate (a) For the first calculatio...

Question: 7.10

Tipping a vending machine According to the U.S. Consumer Product Safety Commission, tipped vending machines caused 37 fatalities between 1978 and 1995 (2.2 deaths per year). Why is tipping vending machines so dangerous? A typical vending machine is 1.83 m high, 0.84 m deep, and 0.94 m wide and has ...

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Solve and evaluate (a) Using the torque equati...

Question: 19.9

Skiing and vibrations Imagine that you ski down a slope wearing a Velcro ski vest and then continue skiing on a horizontal surface at the bottom of the hill. There you run into a padded, Velcro covered cart, which is also on skis (see the figure below). A 1280 N/m spring is attached to the other ...

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Solve and evaluate (a) The velocity of you and...

Question: 19.5

Vibrating cart at end of spring A spring with a 1.6 × 10^4 N/m spring constant and a 0.10-kg cart at its end has a total vibrational energy of 3.2 J. (a) Determine the amplitude of the vibration. (b) Determine the cart’s maximum speed.(c) Determine the cart’s speed when it is displaced 0.010 m from ...

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Solve and evaluate

\text { (a) } A=\sqrt{\...

Question: 18.7

Lighting a bulb A 10-Ω lightbulb is connected between the ends of two parallel conducting rails that are separated by 1.2 m,as shown in the figure below.A metal rod is pulled along the rails so that it moves to the right at a constant speed of 6.0 m/s. The two rails, the lightbulb, its connecting ...

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Solve and evaluate The magnitude of the induce...

Question: 18.6

Transcranial magnetic stimulation The magnitude of the B field from a TMS coil increases from 0 T to 0.2 T in 0.002 s. The B field lines pass through the scalp into a small region of the brain, inducing a small circular current in the conductive brain tissue in the plane perpendicular to the field ...

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Solve and evaluate Combine these two equations...

Question: 18.5

Determine the B field produced by an electromagnet To determine the B field produced by an electromagnet, you use a 30-turn circular coil of radius 0.10 m (30-Ω resistance) thatm rests between the poles of the magnet and is connected to an ammeter. When the electromagnet is switched off, the B ...

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Solve and evaluate ■ Use the mathematical represen...

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