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i need some help on a physics problem dealing with heat

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dave127

Senior member
hey all....i know its been a while since ive posted, not too much free time, but hopefully im nice enough to get an answer 😉 ...I have this physics homework, and its making me mad that i cant figure out this problem...here goes.....

According to the Shooters Bible, a 357-magnum bullet has a kinetic energy of 540 ft*lb at 50 yds form the pistol. If it strikes and comes to rest inside a 1.0 kg block of wood(with a specific heat capacity of 1700 j/kg*K), by how much would the block's temperature change? The bullet is lead and weighs 158 grains. (1.0 grain is equivalent to 0.0648 g).

there it is....the whole problem..any help is appreciated

Dave


<---- is getting ready for the infinite number of flames coming to say "do your own damn homework!!"
 
Convert the kinetic energy of the bullet into Joules. Assuming all the energy is converted into heat when the bullet hits the block, use the formula that relates specific heat to heat and temperature difference. I can't remember off the top of my head - give me a minute...

Edit: Q = mass*specific heat*temperature difference. You know Q (heat), mass, and specific heat. Solve for the temp. difference.
 
thanks...i didnt realize it was that easy....i was thinking i needed to know the temperature of the bullet to figure it out....thanks again!!! 🙂

Dave
 
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