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BITSAT 2022 Solved Question Paper
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© examsnet.com
Question : 10
Total: 130
A machine gun fires 300 bullets per min if the mass of each bullet is
10
g
and the velocity of the bullets is
600
ms
−
1
, the power (in
kW
) of the gun is
43200
9
72
7.2
Validate
Solution:
👈: Video Solution
Work done by the gun = total kinetic energy of the bullets
=
n
1
2
m
v
2
=
300
×
1
2
×
10
×
10
−
3
×
(
600
)
2
=
150
×
10
×
10
−
3
×
600
×
600
Power of gun
=
work
done
Time
taken
=
150
×
10
×
10
−
3
×
600
×
600
60
s
=
9
k
W
(
∵
1
minute
=
60
seconds
)
© examsnet.com
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