Questions
A narrow tunnel is dug along a diameter of earth. A body is released at one end of the tunnel. It R be the radius of earth then the velocity of the body when it passes through the centre of earth is [g= Acceleration due to gravity at the surface]
detailed solution
Correct option is D
At a radial distance r(r≤R), acceleration due to gravity g'=grR∴ Average acceleration of the body a=gRR+02=g2∴ V2=0+2.a.R⇒V2=2.g2R⇒V=gRTalk to our academic expert!
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The masses, each of mass m are kept on the vertices of an equilateral triangle of side a. Find the work needed to be done to change the length of the triangle twice of its original value.
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