You place an ice cube in a microwave oven. If it requires 32,195 J to melt the ice cube and the oven delivers 97 W of power to the ice cube, determine the time (in min) needed to melt the ice cube. min

You place an ice cube in a microwave oven. If it requires 32,195 J to melt the ice cube and the oven delivers 97 W of power to the ice cube, determine the time (in min) needed to melt the ice cube. min

Inquiry into Physics

8th Edition

ISBN:9781337515863

Author:Ostdiek

Publisher:Ostdiek

Chapter5: Temperature And Heat

Section: Chapter Questions

Problem 32P: . The temperature in the deep interiors of some giant molecular clouds in the Milky Way galaxy is 50...

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An electrical power plant has an overall efficiency of 15%. The plant is to deliver 150 MW of electrical power to a city, and its turbines use coal as fuel. The burning coal produces steam at 190C, which drives the turbines. The steam is condensed into water at 25C by passing through coils that are in contact with river water. (a) How many metric tons of coal does the plant consume each day (1 metric ton = 1 103 kg)? (b) What is the total cost of the fuel per year if the delivery price is 8 per metric ton? (c) If the river water is delivered at 20C, at what minimum rate must it flow over the cooling coils so that its temperature doesnt exceed 25C? Note: The heat of combustion of coal is 7.8 103 cal/g.
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