A metal drill of rated power 1000 W drills a hole in a lead cube of mass 2kg at temperature 25^(@)C in 15.8s. The specific heat capacity of lead is 130 J//kg-^(@)C (a) If the efficiency of the drill be 75% what is the total heat generated by it? (b) Assuming, 60% of the heat generated by the drill is being absorbed by the cube, what is its rise in temperature after 10s of the operation of the drill ? (c) What is the final temperature of the lead ?

A metal drill of rated power 1000 W drills a hole in a lead cube of ma

1.	A metal drill of rated power 1000 W drills a hole in a lead cube of mass 2kg at temperature 25^(@)C in 15.8s. The specific heat capacity of lead is 130 J//kg-^(@)C (a) If the efficiency of the drill be 75% what is the total heat generated by it? (b) Assuming, 60% of the heat generated by the drill is being absorbed by the cube, what is its rise in temperature after 10s of the operation of the drill ? (c) What is the final temperature of the lead ?
Answer» ANSWER :`(a) 11.85 KJ (B) 17.3^(@)C (c) 52.3^(@)C`