Geostationary communication satellites are placed in a circular orbit
that is ………m above the surface of earth.
a) 2.59x107m
b) 3.59x107m
c) 4.59x107m
d) 5.59x107m
The mass of sun is 1.99x1030kg, and the radius of the Earth’s orbit around the sun is 1.5x1011m. From this, calculate the orbital speed of earth.
a) 30km/s
b) 40km/s
c) 50km/s
d) 60km/s
When a body is moved from sea level to the top of mountain. There is
change in the body’s…...
a) mass
b) weight
c) none of these
d) both a & b
The value of ‘g’ at equator is……than at poles.
a) smaller
b) larger
c) none
d) same
Two masses are separated by a distance r. if both masses are doubled, the force of interaction between two masses changes by a factor of……………….
a) 2
b) 4
c) 1/2
d) ¼
