drilling machine is used to drill a hole in a 10kg metal block .power of drilling machine is 1kw and it is used for 5 minutes .if 40%of work done by drilling machine is converted into heat in the metal block ,the rise in its temperature is (specific heat is 0.12cal /gm -℃ and j=4.2 j/cal)
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Answered by
3
Answer:
50 degrees celcius is t. Your answer
Answered by
5
Answer:
23.8 C
Explanation:
Here we are given following data;
Power = 1kW = 1000W
Mass =10kg = 10,000 grams
Time = 5 minutes = 5 × 60 = 300s
Specific heat, s= 0.12 x 4.2 = 0.504
Total energy = P × t = 1000 × 300 = 300,000 J
As 40% of energy is converted to heat,
Net Energy available;
ΔQ = 40/100 × 300,000=120,000 J
As ΔQ= m x s x ΔT
ΔT=ΔQ / ms
= 120000 / 10 x 1000 x 0.504 = 23.8 C
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