Some basic physics questions? please answer both parts. i really need help. than

Question

Some basic physics questions? please answer both parts. i really need help. thank you so much!

Problem 12.41 Carlos takes a 10 kg bag of ice at -8 C from a freezer and puts it in the back of his truck Unfortunately, he forgets about it and the ice melts. Part A How much heat energy did it take to melt the ice completely? The specific heat of ice is 2090 J/(kg K) and its heat of transformation from solid to liquid is 3.33 x 105 J/kg. Express your answer to two significant figures and include the appropriate units. 6.2.105 J Submit My Answers Give Up Incorrect; Try Again; 8 attempts remaining Provide Feedback Continue

Explanation / Answer

(a)

Q = m cs ( Tf- Ti) + m L

= 10 ( 2090) ( 0-(-8) + 10 ( 3.33 * 10^5)

=3497200 J

=3.49 * 10^6 J

(b)

from the conservation of energy

energy lost by the water is equal energy gained by the copper

Q w = Qc

mc del T = mc cc del T

1.10 (4190) (28-23)= m ( 385 ( 380-28)

m = 0.17 kg

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