Figure shows variation of acceleration due to gravity with distance from centre of a uniform spherical planet, Radius of planet is $R$. What is $r_2 -r_1.$
$\frac{R}{4}$
$\frac{7R}{4}$
$\frac{4R}{3}$
$2R$
Weightlessness experienced while orbiting the earth in space-ship, is the result of
$Assertion$ : An astronaut experience weightlessness in a space satellite.
$Reason$ : When a body falls freely it does not experience gravity
An iron ball and a wooden ball of the same radius are released from a height $‘h’$ in vacuum. The time taken by both of them to reach the ground is equal is based on
The radii of two planets $A$ and $B$ are $R$ and $4 R$ and their densities are $\rho$ and $\rho / 3$ respectively. The ratio of acceleration due to gravity at their surfaces $\left(g_A: g_B\right)$ will be
${g_e}$ and ${g_p}$ denote the acceleration due to gravity on the surface of the earth and another planet whose mass and radius are twice as that of earth. Then