Five 2.0 kg blocks are arranged as shown on a horizontal surface that the bottom blocks slide on without friction; and there is no friction at the vertical faces of the bottom blocks where they are smacked together. There is however friction at the horizontal faces of the stacked blocks where they are touching, in fact, enough so that the stacked blocks stay arranged as shown while all the blocks move together to the right faster and faster. And the reason the blocks are moving to the right faster and faster is because a hand is pushing 10 N horizontally to the right on the block at the bottom left of the arrangement; and it is the only thing touching the blocks other than the surface.
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The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.
Answers: 3
Five 2.0 kg blocks are arranged as shown on a horizontal surface that the bottom blocks slide on wit...
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