Question

A body weighs 25kg on the surface of the Earth. if the mass of the earth is 6×1024 kg ,the radius of
the earth is 6.4×106m and the gravitational constant 6.7×10-11Nm2kg-2.

Answer 1

Answer:

Given,

Maas of planet = 6*10^24 kg

Radius of planet = 6.4*10^6 m

G = 6.7*10^-11 Nm^2/kg^2

As we know that,

g = (G*m)/r^2

or, g = {(6.7*10^-11)*(6*10^24)}/(6.4*10^6)^2

or g = 9.81 meter per second square

Answer 2

Given that,

Mass of the Earth m1=6×1024Kg

Mass of the Moon m2=7.4×1022kg

Distance between the Earth and the Moon d=3.84×10

5km=3.84×10

8m

Gravitational Constant G=6.7×10−11Nm2/kg2

Now, by using Newton’s law of gravitation

F=r2Gm1m2

F=(3.84×108)26.7×10−11×6×1024×7.4×1022

F=14.8225×1016297.48×1035

F=20.069×1019

F=20.1×1019N

hope it's helpful:))