ew History Bookmarks Develop Window Help Wed 9:47 PM 0 Return to Blackboard Hall

Question

ew History Bookmarks Develop Window Help Wed 9:47 PM 0 Return to Blackboard Halliday, Fundamentals of Ptvysics, 10e Chapter 26, Problem 039 A certain brand of hotdog cooker works by applying a potential ofference o 127 Vacross opposite ends of a hot dog and allowing it to cook by means of the thera energy produced. The current is 12.4 A, and the energy required to cook one hot dog is 60.0 k2. the rate ae which energy is supplied is unchanged, how long it take to cook three hat dogs simultaneouly Number Units tolerance is +/-5% Question Attempts: 0 of 5 used AVE FOR LATER 8

Explanation / Answer

cooker uses potential difference V =127 V and the current is I = 12.4 A,

the total power it uses is P = V I = 127 x 12.4 = 1574.8 W, or 1574.8 joules every second.

If it is divided equally among the 3hot dogs , each hot dog receives 1574.8 / 3 = 524.9W, or 524.9 J of energy every
second.

If each hot dog requires 60,000 J to cook completely, the time needed to cook 3 hot dogs is 60,000 J divided by 524.9 J / s

time taken to cook 3 hot dogs simultaneously is t= 60,000 / 524.9 = 114.3 s (or) 1.9 min

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