A rubber cord catapult has cross-sectional area
25mmand initial length of rubber cord is 10c.
Its is stretched to 5cm and then released to
project a missile of mass 5gm. Taking
Yubber = 5x108N/m² velocity of projected
missile is :
(1) 20ms -
(2) 100ms
(3) 250ms
(4) 200ms)
Solved
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Ответ:
2
1
mv
2
=
2
1
L
YAl
2
where l=5×10
−2
m, A=25×10
−6
m
2
, L=10×10
−2
m, m=5×10
−3
kg
⇒v=
mL
YAl
2
v=
5×10
−3
×10×10
−2
5×10
8
×25×10
−6
×(5×10
−2
)
2
v=250ms
−1
Ответ:
c
Explanation: