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exotic rooftile
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A squash ball of mass 46g is struck against a wall so it hits with a speed of 40m/s, and rebounds with a speed of 25m/s.
Calculate the temperature rise (s.h.c. of rubber is 1600J/kg/K)
This is fine. I use the equation:
heat energy = mass x shc x temperature change
(40 - 25) = 0.046 x 1600 x temperature change
15/73.6 = temperature change
temperature change = 0.2K
Then it asks why is it unecessary to know the mass?
And I cannot for the life of me think why. Is there another equation I'm supposed to know? Have I made a mistake? Am I overlooking something incredibly obvious?
Any help/hints would be very much appreciated.
Thanks,
Rachael
Calculate the temperature rise (s.h.c. of rubber is 1600J/kg/K)
This is fine. I use the equation:
heat energy = mass x shc x temperature change
(40 - 25) = 0.046 x 1600 x temperature change
15/73.6 = temperature change
temperature change = 0.2K
Then it asks why is it unecessary to know the mass?
And I cannot for the life of me think why. Is there another equation I'm supposed to know? Have I made a mistake? Am I overlooking something incredibly obvious?
Any help/hints would be very much appreciated.
Thanks,
Rachael