University Physics with Modern Physics 14th. Edition by Young, Hugh D.; Freedman, Roger A. | 9780321973610 | 0321973615 | Holooly

University Physics with Modern Physics [EXP-35748]

492 SOLVED PROBLEMS

Question: 13.5

“FROM THE EARTH TO THE MOON” In Jules Verne’s 1865 story with this title, three men went to the moon in a shell fired from a giant cannon sunk in the earth in Florida. (a) Find the minimum muzzle speed needed to shoot a shell straight up to a height above the earth equal to the earth’s radius RE.

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IDENTIFY and SET UP: Once the shell leaves the can...

Question: 13.10

“JOURNEY TO THE CENTER OF THE EARTH” Imagine that we drill a hole through the earth along a diameter and drop a mail pouch down the hole. Derive an expression for the gravitational force Fg on the pouch as a function of its distance from the earth’s center. Assume that the earth’s density

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IDENTIFY and SET UP: From the discussion immediate...

Question: 16.7

“PLAY IT LOUD” For an outdoor concert we want the sound intensity to be 1 W/m^2 at a distance of 20 m from the speaker array. If the sound intensity is uniform in all directions, what is the required average acoustic power output of the array?

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IDENTIFY, SET UP, and EXECUTE: This example uses t...

Question: 31.9

“WAKE UP AND SMELL THE (TRANSFORMER)!” A friend returns to the United States from Europe with a 960-W coffeemaker, designed to operate from a 240-V line. (a) What can she do to operate it at the USA-standard 120 V? (b) What current will the coffeemaker draw from the 120-V line?

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IDENTIFY and SET UP: Our friend needs a step-up tr...

Question: 6.10

A “POWER CLIMB” A 50.0-kg marathon runner runs up the stairs to the top of Chicago’s 443-m-tall Willis Tower, the second tallest building in the United States (Fig. 6.28). To lift herself to the top in 15.0 minutes, what must be her average power output? Express your answer in watts, in kilowatts

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IDENTIFY and SET UP: We’ll treat the runner as a p...

Question: 8.2

A BALL HITS A WALL You throw a ball with a mass of 0.40 kg against a brick wall. It is moving horizontally to the left at 30 m/s when it hits the wall; it rebounds horizontally to the right at 20 m/s. (a) Find the impulse of the net force on the ball during its collision with the wall.

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IDENTIFY and SET UP: We’re given enough informatio...

Question: 16.9

A BIRD SINGS IN A MEADOW Consider an idealized bird (treated as a point source) that emits constant sound power, with intensity obeying the inverse-square law (Fig. 16.11). If you move twice the distance from the bird, by how many decibels does the sound intensity level drop?

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IDENTIFY and SET UP: The decibel scale is logarith...

Question: 3.6

A BODY PROJECTED HORIZONTALLY A motorcycle stunt rider rides off the edge of a cliff. Just at the edge his velocity is horizontal, with magnitude 9.0 m/s. Find the motorcycle’s position, distance from the edge of the cliff, and velocity 0.50 s after it leaves the edge of the cliff.

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IDENTIFY and SET UP: Figure 3.22 shows our sketch ...

Question: 24.10

A CAPACITOR WITH AND WITHOUT A DIELECTRIC Suppose the parallel plates in Fig. 24.15 each have an area of 2000 cm^2 (2.00 × 10^-1 m^2) and are 1.00 cm (1.00 × 10^-2 m) apart. We connect the capacitor to a power supply, charge it to a potential difference V0 = 3.00 kV, and disconnect the power

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IDENTIFY and SET UP: This problem uses most of the...

Question: 24.6

A CAPACITORS NETWORK Find the equivalent capacitance of the five-capacitor network shown in Fig. 24.10a.

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IDENTIFY and SET UP: These capacitors are neither ...

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