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 ........ $m/{\sec ^2}$.
$9.8$
$4.9$
$980$
$19.6$
Obtain an expression of acceleration produced by gravity of earth.
A man of $50\, kg$ mass is standing in a gravity free space at a height of $10\, m$ above the floor. He throws a stone of $0.5\, kg$ mass downwards with a speed $2\, m/s$. When the stone reaches the floor, the distance of the man above the floor will be ...... $m$
A body weighs $144 \,N$ at the surface of earth. When it is taken to a height of $h=3 \,R$, where $R$ is radius of earth, it would weigh .......... $N$
Write the equation of acceleration which is used for height $h < \,< R_e$ from the surface of earth.
If it is assumed that the spinning motion of earth increases, then the weight of a body on equator