Last Updated On [03-11-2023]
Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. Length of each string is 
.png)
At moment
, ball 
is imparted a velocity 
perpendicular to the strings and then the system is left on its own
|
Calculate the velocity of |
|||||||
|
a) |
|
b) |
|
c) |
|
d) |
None of these |
Question ID - 101135 :- Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. Length of each string is
At moment , ball is imparted a velocity perpendicular to the strings and then the system is left on its own
Calculate the velocity of 
just before 
collides with ball 
a)
b)
c)
d)
None of these
Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. Length of each string is
At moment , ball is imparted a velocity perpendicular to the strings and then the system is left on its own
|
Calculate the velocity of |
|||||||
|
a) |
|
b) |
|
c) |
|
d) |
None of these |
(a)
Just before ‘
’ collides with ‘
’, the velocities of all particles will be same and along
-axis. Let it be 
At this time let velocity of ‘
’ be 
along 
-axis, and that of ‘
’’ be 
along 
-axis
.png)
From conservation of momentum along 
-axis,
Next Question :
|
A car of length 3 m moves at a constant velocity 36 km/hr. A man wants to take a photo of side view of the car. The size of the image of the car is 1.5 cm long. The time of exposure needed for the car to get a clear picture, if the image should not move more than 0.1 mm, is: |
|||||||
|
(a) |
1.5 x 10-3 s |
(b) |
3 x 10-3 s |
(c) |
2.8 x 10-3 s |
(d) |
2 x 10-3 s |
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