Questions from Modern Physics


Q: Scale length is the length of the part of a guitar string

Scale length is the length of the part of a guitar string that is free to vibrate. A standard value of scale length for an acoustic guitar is 25.5 in. The frequency of the fundamental standing wave on...

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Q: In your physics lab, an oscillator is attached to one end

In your physics lab, an oscillator is attached to one end of a horizontal string. The other end of the string passes over a frictionless pulley. You suspend a mass M from the free end of the string, p...

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Q: You are measuring the frequency dependence of the average power Pav transmitted

You are measuring the frequency dependence of the average power Pav transmitted by traveling waves on a wire. In your experiment you use a wire with linear mass density 3.5 g/m. For a transverse wave...

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Q: A planet makes a circular orbit with period T around a star

A planet makes a circular orbit with period T around a star. If the planet were to orbit at the same distance around this star, but the planet had three times as much mass, what would the new period (...

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Q: A deep-sea diver is suspended beneath the surface of Loch

A deep-sea diver is suspended beneath the surface of Loch Ness by a 100-m-long cable that is attached to a boat on the surface (Fig. P15.77). The diver and his suit have a total mass of 120 kg and a v...

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Q: For a planet in our solar system, assume that the axis

For a planet in our solar system, assume that the axis of orbit is at the sun and is circular. Then the angular momentum about that axis due to the planet’s orbital motion is L = MvR. (a) Derive an ex...

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Q: The most efficient way to send a spacecraft from the earth to

The most efficient way to send a spacecraft from the earth to another planet is to use a Hohmann transfer orbit (Fig. P13.79). If the orbits of the departure and destination planets are circular, the...

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Q: An astronaut inside a spacecraft, which protects her from harmful radiation

An astronaut inside a spacecraft, which protects her from harmful radiation, is orbiting a black hole at a distance of 120 km from its center. The black hole is 5.00 times the mass of the sun and has...

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Q: Mass M is distributed uniformly over a disk of radius a.

Mass M is distributed uniformly over a disk of radius a. Find the gravitational force (magnitude and direction) between this disk-shaped mass and a particle with mass m located a distance x above the...

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Q: What is the escape speed from a 300-km-diameter

What is the escape speed from a 300-km-diameter asteroid with a density of 2500 kg/m3?

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