Physics · 2020
JEE Main · 6 September 2020, Shift 2 · Q6
Two planets have masses M and 16 M and their radii are a and 2a, respectively. The separation between the centres of the planets is 10a. A body of…
Two planets have masses M and $\displaystyle 16$ M and their radii are a and 2a, respectively. The separation between the centres of the planets is 10a. A body of mass m is fired from the surface of the larger planet towards the smaller planet along the line joining their centres. For the body to be able to reach at the surface of smaller planet, the minimum firing speed needed is :
Official answer
(2)
$\displaystyle \frac{3}{2} \sqrt{\frac{5 G M}{a}}$
More from Gravitation
- The time period of a satellite of earth is 10 hours. If the separation between the earth and the satellite is increased to 16 times the previous…2021
- The weight of a body at the surface of earth is 18 N. The weight of the body at an altitude of 3200 km above the earth's surface is (given, radius of…2023
- A body of mass is taken from earth surface to the height h equal to twice the radius of earth (R_e), the increase in potential energy will be: ( g=…2023
- The radii of two planets 'A' and 'B' are 'R' and '4R' and their densities are ρ and ρ / 3 respectively. The ratio of acceleration due to gravity at…2023
- Given below are two statements: Statement I: Acceleration due to earth's gravity decreases as you go 'up' or 'down' from earth's surface. Statement…2023
- Given below are two statements: Statement I: A satellite is moving around earth in the orbit very close to the earth surface. The time period of…2026
- A body weighs 49 N on a spring balance at the north pole. What will be its weight recorded on the same weighing machine, if it is shifted to the…2021
- If a body of mass 1 kg falls on the earth from infinity, it attains velocity (v) and kinetic energy (k) on reaching the surface of earth. The values…2026
JEE Main 2020 Physics question, with the answer from NTA’s final answer key. Where our answers come from.