Question

With a more realistic estimation, we assume only 90% of the heat generated is absorbed by a lead bullet. If the lead bullet is initially at room temperature of 20.0°C, what is the minimum speed of the bullet if it just reaches the melting point of 327°C inside the pine wall when it stops? (As we can see in the next section, it will take much more energy to actually melt it.)
v_min =

(As you can see from the pictures, I already attempted the question with an answer of 341.14 m/s, that is wrong.)

Answer 1

heat raauird to juuen ct melting pint H3 m st S 130 /Kg m x130x (3 27- 20) mx130 x 3o7 J . Tot Mat genentin ai be loOx mx 13 o X307. kinte enrg -f blat X130 x307 X 2×100 ×130×30子 an, 29.81 m/8 The miimum gkud &houhd be 29.81 m .