Waves on a String: Transverse waves travel at 43.2 m/s in a string that is subjected to a tension of 60.5 N. If the string is 15.9 m long, what is its mass?

A. 0.515 kg
B. 0.216 kg
C. 0.366 kg
D. 0.597 kg


Answer: A

Physics & Space Science

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Time Dilation: Suppose one twin takes a ride in a spaceship traveling at a very high speed to a distant star and then back again, while the other twin remains on Earth. Compared to the twin who remained on Earth, the astronaut twin is

A. younger than the Earth-twin. B. the same age as the Earth-twin. C. older than the Earth-twin. D. The ages cannot be determined from the information provided.

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A straight wire carries a current of 10 A at an angle of 30° with respect to the direction of a uniform 0.30-T magnetic field. Find the magnitude of the magnetic force on a 0.50-m length of the wire

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Physics & Space Science

Frame dragging is a complex consequence of general relativity. It can be simplified into a classical analog, however, demonstrated by which of the following situations?

a. A merry-go-round spins objects further from the center of rotation at faster linear speeds. b. A flamenco dancer's dress as she spins quickly a full turn. c. An elevator falling in a uniform gravitational field that has a hole in it to let light through. d. A rubber sheet with a heavy ball at rest and a rolling ball with its trajectory changed by the depression in the sheet. e. A figure skater in a spin moves her arms closer to her body and the rate of spin increases.

Physics & Space Science