What is the momentum of ⦁ A rifle bullet of mass 15 g and speed 600 m/s? ⦁ An arrow of mass 40 g and speed 80 m/s?
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Momentum carried by 1 bullet=P
1bullet
=m
lb
×v
=5×10
−3
×600
⇒P
1b
=3 kg.m/s
∵ Total momentum carried by bullets in 1 min:
P
1min
=P
lb
×100=300kg. m/s
∴ By Newton's second law: <
F
ˉ
>=Average force needed to hold the gun
T- Time taken for the momentum change.
<
F
ˉ
>=
T
P
ˉ
1min
=
60
300kgm/s
⇒<
F
ˉ
>=5N
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