Questions
Directions :These questions consists of two statements each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.
Assertion : A body is moving along a circle with a constant speed. Its angular momentum about the
centre of the circle remains constant.
Reason : In this situation, a constant non-zero torque acts on the body.
detailed solution
Correct option is C
L about centre = mvR = constantA s, τ=dLdt and derivative of any constant is zero.∴ τcentre =0Talk to our academic expert!
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A disc can rotate about an axis passing through its centre and perpendicular to the plane of the disc. Initially the disc is stationary and its moment of inertia about the axis is 4 Kg-m2. A torque is applied on the disc which varies with time according to the graph shown in figure. Then angular velocity of the disc at the end of 6th second is
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