Q. 34.2( 4 Votes )
Different points A. the torque is zero.
B. the torque causes the earth to spin.
C. the rigid body result is not applicable since the earth is not even approximately a rigid body.
D. the torque causes the earth to move around the sun.
if we consider earth and sun as a system, the earth experiences a centripetal force due to gravitational force of attraction of sun, and thus revolves around the sun in a circular orbit.
We know that,
Torque of any force F about a point is defined as
r⃗ = distance of point of application of force from the point about which torque is to be calculated.
Since earth is symmetrical in shape, the net force due to sun acts on the centre of earth and since gravitational force is along line joining the centre of mass of earth and sun, the angle between r⃗ and F⃗ becomes 0°.
Therefore from eqn.(i)
τ = 0
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