Last Updated On 01-06-2023 - By Jeesha Sara
A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of 2 kg which is suspended by a string of length 5m. The centre of gravity of the block is found to rise a vertical distance of 0.1m. What is the speed of the bullet after it emerges from the block?
a)
200 m/s
b)
220 m/s
c)
204 m/s
d)
284 m/s
A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of 2 kg which is suspended by a string of length 5m. The centre of gravity of the block is found to rise a vertical distance of 0.1m. What is the speed of the bullet after it emerges from the block?
a)
200 m/s
b)
220 m/s
c)
204 m/s
d)
284 m/s
Question ID - 100190 :-
A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of 2 kg which is suspended by a string of length 5m. The centre of gravity of the block is found to rise a vertical distance of 0.1m. What is the speed of the bullet after it emerges from the block?
a)
200 m/s
b)
220 m/s
c)
204 m/s
d)
284 m/s
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A bullet of mass 0.01 kg and travelling at a speed of 500 m/s strikes a block of 2 kg which is suspended by a string of length 5m. The centre of gravity of the block is found to rise a vertical distance of 0.1m. What is the speed of the bullet after it emerges from the block? |
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a) |
200 m/s |
b) |
220 m/s |
c) |
204 m/s |
d) |
284 m/s |
|
(b) Suppose the velocity of the bullet of mass Applying law of conservation of linear momentum, we get
Or 500 Or 5 = 2 Now, the kinetic energy gained by the block
Or Putting the value of
|
is 
and it strikes the block of mass
. After collision, the linear velocity of the block is 
and that of the bullet is
0.01 = 2
+0.01
+ 0.01
(i)
raises it to a height 
where it gains gravitational potential energy 
By conservation of energy, we get
m/s
in Eq. (i), we get
or
m/sNext Question :
A disc of radius 
rolls on a horizontal ground with linear acceleration 
and angular acceleration 
as shown in Figure. The magnitude of acceleration of point 
asshown in the figure at an instant when its linear velocity is 
and angular velocity is 
will be
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a) |
|
b) |
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c) |
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d) |
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