Physics, 17.02.2021 17:10 bigboyethanlanp2s9lm
Mr. Rosa’s student is late for class. They start walking at 2.2m/s and then start sprinting at 3.3 m/s in 10 seconds. How fast did the student accelerate?
What is your known?
What is your unknown?
Plug it in.
What is your answer?
Answers: 3
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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
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