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A body of mass mass 2500kg starts moving from rest and at certain point of time , it comes to a constant speed of 150000000m/s.Suppose, as soon as it comes to this speed,a stationary observer instantaneously calculates the gravitational force between the body and a nearby rock of mass 1200 kg, which is at a distance of 0.00005 m from the rock.If the person calculates the quantity correctly, what will be the sum of the non-zero digits of the answer ? For calculation take G= 7 * 10^-11(Nm^2)/kg^2
The answer is 21.
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1 solution
If you got your answer to be wrong, then it is due to relativity.When an object moves at half of the speed of light, its increase in mass is noticeable.The mass of the body increases by 15% of the original.So the new mass of the body is 2875 and not 2500. so m1 = 2875, m2 = 1200 and the rest is same.You need to calculate it by the formula F=(Gm1*m2)/r^2