A planet is moving along an elliptical orbit is closest to the sun at a distance $r_1$ and farthest away at a distance $r_2$. If $v_1$ and $v_2$ are the linear velocities at the points respectively, then the ratio $v_1/v_2$ is

Q. A planet moving along an elliptical orbit is closest to the sun at a distance $r_1$ and farthest away at a distance of $r_2$. If $v_1$ and $v_2$ are the linear velocities at these points respectively, then the ratio $v_1/v_2$ is?

Q. Two particles 'A' and 'B', move with constant velocities $\overrightarrow{v_1}$ and $\overrightarrow{v_2}$ respectively. At the initial moment, their position vectors are $\overrightarrow{r_1}$ and $\overrightarrow{r_2}$ respectively. The condition for particle 'A' and 'B' for their collision is

Q.

A planet P is moving in an elliptical path around the sun S. Speed of planet in positions P and Q are $v_1$ and $v_2$ respectively with SP= $r_1$ and SQ= $r_2$, then $\frac{v_1}{v_2}$ is equal to

Q. Two planets are revolving around the Earth with velocities $v_1,v_2$ and in radii $r_1$ and $r_2$ ($r_1>r_2$) respectively. Then

Q. The emf (V) and internal resistance ($r$) of a single battery which is equivalent to a parallel combination of two batteries of emf's $V_1$ and $V_2$ and internal resistance $r_1$ and $r_2$, respectively, with polarities as shown in the figure are given by $\frac{V_1{r}_2-V_2{r}_1}{r_1+r_2},\frac{r_1{r}_2}{r_1+r_2}$.