Weightlessness experienced while orbiting the earth in space-ship, is the result of
Inertia
Acceleration
Zero gravity
Free fall towards earth
The mass and diameter of a planet have twice the value of the corresponding parameters of earth. Acceleration due to gravity on the surface of the planet is ........ $m/{\sec ^2}$.
Assuming the earth to be a sphere of uniform mass density, how much would a body weigh (in $N$) half way down to the centre of the earth if it weighed $250\; N$ on the surface?
If all objects on the equator of earth feel weightless then the duration of the day will nearly become ....... $hr$
What should be the angular speed with which the earth have to rotate on its axis so that a person on the equator would weigh $\frac{3}{5}$ th as much as present?
If ${R}_{{E}}$ be the radius of Earth, then the ratio between the acceleration due to gravity at a depth $' {r} '$ below and a height $' r '$ above the earth surface is:
(Given : $\left.{r}<{R}_{{E}}\right)$