Two identical balls ‘A’and 'B'are moving with
same velocity. If velocity of 'A' is reduced to
half and of 'B' to zero, then the rise in
temperatures of 'A' to that of 'B' is
1) 3:4 2) 4:1 3) 2:1 4)1:1
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Two identical balls ‘A’and 'B'are moving with
same velocity. If velocity of 'A' is reduced to
half and of 'B' to zero, then the rise in
temperatures of 'A' to that of 'B' is
1) 3:4 2) 4:1 3) 2:1 4)1:1
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Answer:
correct answer is option : 1 = 3: 4
Explanation:
For ball A:
mass= m
velocity=v
specific heat =s
Energy dissipated for ball A= Initial k.e- final k.e
= -
=3/8 mv²
msΔTA= 3/8 mv²
For ball b:
Energy dissipated by ball b= 1/2 m v² - 0
=1/2 m v²
msΔTb=1/2 m v²
ΔTb= v²/2s
ΔTa/ Δtb= 3v²x2s/ 8s x v²
= 3/4
∴ΔTa:ΔTb= 3:4
Answer:
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