When the earth shrinks to half of its radius, without reducing its mass, what change will be there in the duration of a day?

If earth be at half of its present distance from the sun, how many days will there be in a year?

If a tunnel is dug through the earth from one side to the other along a diameter and a body is dropped in it, what will be the nature of its motion ?

The radius of sphere is measured with an error of 2% what will be the error in its volume ?

Let the resistance of an electrical component remains constant while the potential difference across the two ends of the component decreases to half of its former value. What change will occur in the current through it?

If the earth suddenly contracts to one third of its present radius, how much would the day be shortened ?

If the radius of earth strinks by one percent it mass remaining the same by what percent will the acceleration due to gravity change at surface.

If the radius of earth becomes half of it's present radius how many times decrease in a day.

What is half life? Deduce its relation with lambda .

If the earth stops rotating about its own axis, what is the effect on the value of weight of any object on the surface of earth?

A body weighs 63 N on the surface of the earth. What is the gravitational force on it due to the earth at a height equal to half the radius of the earth?