The head of a hammer with a mass of 1.2 kg is allowed to fall onto a nail from a height of 0.50 m. What is the maximum amount of work it could do on the nail? Why do people not just “let it fall” but add their own force to the hammer as it falls?
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A sailor strikes the side of his ship just below the waterline. He hears the echo of the sound reflected from the ocean floor directly below 2.0 s later. How deep is the ocean at this point? Assume the speed of sound in sea water is 1560 m/s (Table 12–1) and does not vary significantly with depth.
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One CD player is said to have a signal-to-noise ratio of 82 dB, whereas for a second CD player it is 98 dB. What is the ratio of intensities of the signal and the background noise for each device?
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The magnetic flux through a coil of wire containing two loops changes at a constant rate from -58 Wb to +38 Wb in 0.34 s. What is the emf induced in the coil?
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The platter of the hard drive of a computer rotates at 7200 rpm (rpm = revolutions per minute = rev/min). (a) What is the angular velocity (rad/s) of the platter? (b) If the reading head of the drive is located 3.00 cm from the rotation axis, what is the linear speed of the point on the platter just below it? (c) If a single bit requires 0.50 µs of length along the direction of motion, how many bits per second can the writing head write when it is 3.00 cm from the axis?
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For about 10 years after the French Revolution, the French government attempted to base measures of time on multiples of ten: One week consisted of 10 days, one day consisted of 10 hours, one hour consisted of 100 minutes, and one minute consisted of 100 seconds. What are the ratios of (a) the French decimal week to the standard week and (b) the French decimal second to the standard second?
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A uniform magnetic field of magnitude 0.50 T is directed perpendicular to the plane of a rectangular loop having dimensions 8.0 cm by 12 cm. Find the magnetic flux through the loop.
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Add (9.2 * 10^3 s) + (8.3 * 10^4 s) + (0.008 * 10^6 s).
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Superman must stop a 120-km/h train in 150 m to keep it from hitting a stalled car on the tracks. If the train’s mass is 3.6 * 10^5 kg, how much force must he exert? Compare to the weight of the train (give as %). How much force does the train exert on Superman?
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