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(from Ohanian) The outer edge of the grooved area of a long-playing record is at a radial distance 35 cm from the center; the inner edge is at a radial distance of 17 cm. The record rotates at 3.8 rev/min. The needle of the pick-up arm takes 1.6 minutes to move uniformly from the outer edge to the inner edge.
What is the radial speed of the needle?
What is the speed of the outer edge relative to the needle?
What is the speed of the inner edge relative to the needle?
Suppose the phonograph is turned off, and the record uniformly and stops rotating after 10 s. What is the angular acceleration?
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A roof-top solar water heater collects 50% of the 200 W/m^2 provided by the sun, using absorbers with a total area of 30m^2. If water enters the system at 15(C), how many hours will be required to warm 150kg of water to 60(C) using this heater? (Y..
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A certain car battery with a 12.0 V emf has an initial charge of 178 A•h. assume that the potential across the terminals stays constant until the battery is totally discharged, for how long in hours can it deliver energy at the rate of 115 W.
a 12.0 kg mass lies at x=-80.0 cm. A 21.0 kg mass is at x= 70.0 cm. The 12.0 kg mass is not moved to a different point on the x-axis. There is not a zero net force on the 10.0 kg mass. What is the new location of the 12.0 kg mass
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What minimum heat is needed to bring 138g water at 22°C to the boiling point and completely boil it away.
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