College Physics 1st. Edition by Paul Peter Urone - Roger Hinrichs | 9781938168000 | 1938168003 | Holooly

College Physics[EXP-4825]

252 SOLVED PROBLEMS

(a) A defibrillator passes 12.0 A of current through the torso of a person for 0.0100 s. How much charge moves? (b) How many electrons pass through the wires connected to the patient? (See figure above.)

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(a) A defibrillator sends a 6.00-A current through the chest of a patient by applying a 10,000- V potential as in the figure below. What is the resistance of the path? (b) The defibrillator paddles make contact with the patient through a conducting gel that greatly reduces the path resistance.

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Question: 19.5

(a) An electron gun has parallel plates separated by 4.00 cm and gives electrons 25.0 keV of energy. What is the electric field strength between the plates? (b) What force would this field exert on a piece of plastic with a 0.500 μC charge that gets between the plates? Strategy Since the voltage

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Solution for (a) The expression for the magnitude ...

Question: 23.11

(a) Calculate the capacitive reactance of a 5.00 mF capacitor when 60.0 Hz and 10.0 kHz AC voltages are applied. (b) What is the rms current if the applied rms voltage is 120 V? Strategy The capacitive reactance is found directly from the expression in XC = 1/2π fC. Once XC has been found at each

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Solution for (a) Entering the frequency and capaci...

Question: 6.4

(a) Calculate the centripetal force exerted on a 900 kg car that negotiates a 500 m radius curve at 25.0 m/s.(b) Assuming an unbanked curve, find the minimum static coefficient of friction, between the tires and the road, static friction being the reason that keeps the car from slipping

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Strategy and Solution for (a) We know that

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Question: 23.10

(a) Calculate the inductive reactance of a 3.00 mH inductor when 60.0 Hz and 10.0 kHz AC voltages are applied. (b) What is the rms current at each frequency if the applied rms voltage is 120 V? Strategy The inductive reactance is found directly from the expression XL = 2π fL .Once XL has been found

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Solution for (a) Entering the frequency and induct...

Question: 8.1

(a) Calculate the momentum of a 110-kg football player running at 8.00 m/s. (b) Compare the player’s momentum with the momentum of a hardthrown 0.410-kg football that has a speed of 25.0 m/s.

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Solution for (a) To determine the momentum of the ...

Question: 15.7

(a) Calculate the work output of a Carnot engine operating between temperatures of 600 K and 100 K for 4000 J of heat transfer to the engine. (b) Now suppose that the 4000 J of heat transfer occurs first from the 600 K reservoir to a 250 K reservoir (without doing any work, and this produces the

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Solution (a) The Carnot efficiency is given by [la...

Question: 20.7

(a) Consider the examples given in Ohm’s Law: Resistance and Simple Circuits and Resistance and Resistivity. Then find the power dissipated by the car headlight in these examples, both when it is hot and when it is cold. (b) What current does it draw when cold?

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Strategy for (a) For the hot headlight, we know vo...

Question: 6.6

(a) Find the acceleration due to Earth’s gravity at the distance of the Moon.(b) Calculate the centripetal acceleration needed to keep the Moon in its orbit (assuming a circular orbit about a fixed Earth), and compare it with the value of the acceleration due to Earth’s gravity that you have just

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Solution for (a) Substituting known values into th...

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