If the earth rotates faster than its present speed, the weight of an object will
Increase at the equator but remain unchanged at the poles
Decrease at the equator but remain unchanged at the poles
Remain unchanged at the equator but decrease at the poles
Remain unchanged at the equator but increase at the poles
The acceleration due to gravity at height $h$ above the earth if $h \ll R$ (radius of earth) is given by
A spring balance is graduated on sea level. If a body is weighed with this balance at consecutively increasing heights from earth's surface, the weight indicated by the balance
Weight of $1 \,kg$ becomes $1/6$ on moon. If radius of moon is $1.768 \times {10^6}\,m$, then the mass of moon will be
If radius of the earth is $6347\, km ,$ then what will be difference between acceleration of free fall and acceleration due to gravity near the earth's surface ?
In order to find time, the astronaut orbiting in an earth satellite should use