Scott and jafar are ready to work a problem. in this simulation, assume the coordinates of the points are as follows. a (0 s, 30 m); b (10 s, 50 m); c (20 s, 38 m); d (30 s, 0 m); e (40 s, −38 m); and f (50 s, −50 m) recall the definitions of average speed, vavg ≡ d δt , and average velocity in the x direction, vx ,avg ≡ δx δt . find the average velocity from circled a to circled b. vx, avg = 11 2 correct: your answer is correct. m/s find the average velocity from circled b to circled d. vx, avg = 12 -2.5 correct: your answer is correct. m/s find the average velocity from circled a to circled f. vx, avg = 13 -1.6 correct: your answer is correct. m/s find the average speed from circled a to circled f. vavg = 14 1.6 incorrect: your answer is incorrect.
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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
Scott and jafar are ready to work a problem. in this simulation, assume the coordinates of the point...
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