1.

The mass of body on surface of the earth is 100kg. What will be its (i) mass and (ii) weight atan altitude of 1000 km?(R=6400 km, g = 9.8 m/s)

Answer»

(i) Mass doesn't change. It remains constant in all situations. so, mass of body at an altitude of 1000km must be 100kg.

(ii) we know, g=g°/(1+h/R)^2

g°=9.8m/s^2

h = 1000km and R = 6400 km

now, g' = 9.8/(1 + 1000/6400)² = 7.33 m/s²

so, weight = mass × acceleration due to gravity

= 100kg × 7.33 m/s² = 733N.



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