A 100 g iron bullet is shot into, and comes to rest in, 1000 g of water. The wat

Question

A 100 g iron bullet is shot into, and comes to rest in, 1000 g of water. The water is in a foam container of negligible heat capacity. The speed of the bullet when it hits the water is 200 m/s, and the initial temperature of the bullet and the water is 23C. The specific heat of iron is 470 J/kg·K, of water is 4186 J/kg·K. Assuming no heat is gained from or lost to the environment, what is the final temperature of the bullet and the water?

a) 23C - they are in thermal equilibrium

b) 23.5C

c) 495

C d) 0.5C

e) Need specific heats in J/kg· C to determine temp

please explain your answer thanks

Explanation / Answer

Option "A" Heat transfer will take place only when there is difference in temperature of the two bodies(here bullet and water). Since here temperature of both the bodies is already equal and you have not given any external heat. Moreover there is no loss or gain of heat from external environment. Therefore the temperature of the system will remain 23 C. There would be heat generated because of the friction between bullet and water but for that we need other parameters also to calculate the heat generated, but here those parameters are not given that means it assumes that there is no heat generated due to friction.

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