1) Calculate the force of gravitation between the earth and the Sun where the mass of the earth = 6 x 1024 kg and the mass of the Sun = 2 x 1030 kg. The average distance between the two is 1.5 x 1011 m.
Ans. The mass =6 x 1024 kg
The mass of the Sun = 2 x 1030 kg
The average distance between the earth and the Sun, (d) = 1.5 x 1011 m
The gravitational constant (G) = 6.67 x 10-11 Nm2 /Kg2
The gravitational force of attraction between m1 and m2 can be found out using this formula
F=Gm1m2r2�=��1�2�2
F=6.67×10−112×1030×6×1024(1.5×1011)2�=6.67×10−112×1030×6×1024(1.5×1011)2
F = 3.557 × 1022 N.
2) A body of 55 kg falls from the fifth floor of a building 90 m high. What is the work done by gravitational force?
Answer: The body falls within the action of the force of gravity. To calculate the work done, this formula should be used: m = 55 kg, g = 9.8 m/s2, h = 90 m.
W = 55 kg x 9.8 m/s2 x 90 m
W = 48,510 J.
Therefore, this is the work done by the gravitational force.
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