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Q.

Calculate the acceleration produced in a 2 kg rock due to earth (Assume the mass of earth M=6 × 1024 kg, radius of earth(r) = 6.4 × 106 m).


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a

98 m/s2

b

9.8 m/s2

c

0.98 m/s2

d

980 m/s2 

answer is B.

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Detailed Solution

The acceleration produced in a 2 kg rock due to earth is 9.8 m/s2
Given data and assumptions:
Mass of the rock, m=2 kg
Mass of the earth M=6 × 1024 kg
Radius of earth,(r)=6.4 × 106 m
Universal gravitational constant, G=6.67 × 10-11m2/kg2
We can calculate the force experienced by the earth on the rock using the Universal Law of Gravitation.
      = GMmr2
       = 6.67 × 10-11 × 6 × 1024  × 2 (6.4 × 106 )2
        = 19.6 N
Dividing the force from the mass of the rock we get the acceleration produced in the rock
= Fm
=19.62 
= 9.8 m/s2
 
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