MCQ Quiz - Physics - Newton's Laws of motion
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2 bodies with mass m1 & m2 are connected by a string.m2 hangs vertically while ,1 rests on a incline. Both are connected by a string and are at rest.Find the angle of incline.
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Assume incline is frictionless
Sinˉ¹(2m1/m2)
Sinˉ¹(m1/m2)
Sinˉ¹(m2/m1)
Cosˉ¹(m1/m2)
In the above question find the force due to the incline on m1.
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Assume incline is frictionless
m1g
m2g
g√(m1²-m2²)
(m2²g)/m1
There are infinite blocks in a row with masses decreasing in a G.P with common ratio 0.5. If a force ''F'' is applied on the first body and the system accelerates with "a". Find the mass of the largest block.
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Assume all the bodies are always in contact.
F/a
F/2a
F/3a
F/4a
A block of mass "m" sits atop a mass"2m". A force "f" is applied horizontally on the upper block. Can the lower block ever move?
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Assume all the bodies are always in contact and that the coeff of friction is uniform everywhere.
No, it can never move
It can move if "f"²≥umg
It can move if "f"²≥3umg
None of the above.
Consider in the above question that "f" is applied at the bottom block. What is the min. valueof "f" needed for slipping between the blocks?
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Assume all the bodies are always in contact and that the coeff of friction is uniform everywhere.
No, it can never happen
It can move if "f"²≥6umg
It can move if "f"²≥4umg
None of the above.
A block is fixed between two springs with spring constant "k1"& "k2".It is displaced by "x" and left. Find the velocity when it reaches the mid point.
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√((k1+k2)/m*x)
√(k1/m*x)
√(k2/m*x)
√(k1k2/((k1+k2)m)*x)
A mass suspended with 2 ropes making angles α&β w.r.t to the horizontal. Find the ratio of tension in the ropes.
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Mass of block is "m"
sinα/sinβ
tanα/tanβ
cosα/cosβ
cos²α/cos²β
A pendulum swings with the help of a string.The lenght of the string is "l"& the velocity "v' at the lowermost point. Find the max. angle traversed w,r,t to the vertical.
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Sinˉ¹(1-(v²/2gl))
Cosˉ¹((2gl-v²)/2gl)`
Cosˉ¹(v²/gl)
Sinˉ¹(v/√(gl))
A sleeve sits on a fixed rod rotating with constant "w". Find "w" so that it just begins to slip?
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Coeff. of friction is "u"
√(ug/r)
√(2ug/r)
√(ug/2r)
2√(ug/r)
What must the acceleration of a lift going up be so that a block of mass "M" exerts 4Mg on the floor.
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4g
2g
3g
g
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