A pendulum of length 
is suspended on a flat car that is moving with a velocity u on the horizontal road. If the car is suddenly stopped, then: ( A ssume bob of pendulum does not collide anywhere)
A
the maximum angle θ with the initial vertical line through which the pendulum swing is 
B
the maximum angle θ with the initial vertical line through which the pendulum swing is 
C
if maximum angle is 60°, 
= 5 m and g = 9.8 m/s 2 , then the initial speed of car u is 7 m/s
= 5 m and g = 9.8 m/s 2 , then the initial speed of car u is 7 m/s
D
if maximum angle θ is 30°, 
= 5 m and g = 9.8 m/s 2 , then the initial speed of car u is 6 m/s
= 5 m and g = 9.8 m/s 2 , then the initial speed of car u is 6 m/s
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(b, c)
Using conser0vation of energy
mu 2 + 0 = 0 + mg λ (1 – cos θ )
u 2 = 2 g λ × 2sin 2 
or 
= 
⇒ θ = 2 sin –1 
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