Suppose the sun expands so that its radius becomes `100` times its present radius and its surface temperature becomes half of its present value. The total energy emited by it then will increase by a factor of :

Suppose that the sun expands, so that its diameter becomes 10 times its present diameter and its surface temperature becomes half of its present value. Then the total energy emitted by the sun per unit time, will increase by a factor of

If earth radius reduces to half of its present value then the time period of rotation will become:

When a wire is stretched and its radius becomes r//2 then its resistance will be

If the radius of the earth becomes half of its present value (mass remaining the same ), the new length of the day would be

If radius of earth becomes n times its present value, without change in mass, then duration of day becomes

Suppose the distance between earth and sun becomes half of its present distance. What is likely to happen to life?

If diameter of earth becomes half of its present value and its mass becomes four times its present value, how would the weight of any object on the surface of earth be affected ?