Name: Date PHY 113: Calculus-based Physies II-EXAM 2 Fall 2016 Answer the follow

Question

Name: Date PHY 113: Calculus-based Physies II-EXAM 2 Fall 2016 Answer the following problems on the pages provided. You may use the 8 ½ by 11 study sheet that you calculator if needed Cell phones are not allowed if I see one out you will receive and automatic zero D prepared prior to the exam. This has to be passed in when you pass in your exam Use your own not sit directly near anybody else if possible. There are different versions of this esam to prevent cheating. If you are caught talking to any other classmate during the esam you will receive an automatic zero Problem 1: A small electric immersion heater is used to heat 150 g of water for a cup of instant coffee. The heater is labeled-300 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 23.0 C to 100 C. ignoring any heat losses. 110pts

Explanation / Answer

Mass of water, m = 150 g

Specific heat capacity of water, c = 4.184 joules/g/C

Temperature difference, T = 100 - 23 = 77

Heat energy required , H = mcT = 150*4.184*77 = 48325.2 J

Power = Energy / time

Time = 48325.2 / 300 =161.1 s = 2.68 min

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