The young’s modulus of a wire of length L and radius r is y newton per square metre. If the length is reduced to and radius . Its young’s modulus will be
A boy of mass m stands on one end of a wooden plank of length L and mas M. The plank is floating on water. If the boy walks from one end of the plank to the other end at a constant speed, the resulting displacement of the plank is given by
A sphere of solid material of relative density 9 has a concentric spherical cavity and just sinks in water. If the radius of sphere be R, then the radius of cavity (r) will be related to R as
1. r3 = \({{8}\over{9}}\)R3
2. r3 = \({{2}\over{3}}\)R3
3. r3 = \({{\sqrt{8}}\over{3}}\)R3
4. r3 = \({{\sqrt{2}}\over{3}}\)R3
Subtopic: Archimedes' Principle |
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A car is travelling with a linear velocity v on a circular road of radius r. If it is increasing its speed at the rate of a m/s2, then the resultant acceleration will be
A uniform magnetic field parallel to the plane of paper, exsisted in space initially directed from left to right. When a bar of soft iron is placed in the field parallel to it, the lines of force passing through it will be represented by figure.