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ryu1
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Homework Statement
1.5ton (1500kg) object is dropped from 20 meters into a bucket with 2.5L of water in it.
All the kinetic energy is transferred to the water in form of heat.
What is the temperature rise of the water?
2. how much the water temperature rises if the object lifts during it's fall, another mass(no friction involved) making it do work, spending 900.0 J before hitting the water.
The Attempt at a Solution
right not sure if i did this right but i might did:
Ek = 0.5*1500kg*(9.81ms^-2)^2 = 750kg*96.2361m/s = 72127.075m/s
72127.075m/s = 72.127KJ
specific heat of water = 4.19KJ/Kg*C
so
72.127KJ = 4.19KJ/Kg*C * 2.5Kg[=2.5L of water right?] *dT
dT=6.886C
temperature rise by 6.886 degrees Celsius.
is that actually correct?
trying the 2nd problem for now, waiting for your answer :)
right, for the 2nd problem, can we just decrease 900 from the 72127.075m/s (=72127.075J) and then calculate the whole thing exactly the same way?
arriving to dT=6.7997 Celsius?
please let me know if I am correct on this.
Thanks a lot! :)
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