Q. The radius of the earth is about 6400 km and that of the mars is 3200 km. The mass of the earth is about 10 times the mass of the mars. An object weighs 200 N on the surface of earth, its weight on the surface of mars will be
A) 8 N
B) 20 N
C) 40 N
D) 80 N
Explanation
(d) Weight on mars $= mg^{'} = \frac{mG(m/10)}{(R/2)^{2}\ }$
$= m \times \frac{4}{10}mg = \frac{4}{10} \times 200 = 80\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.