+91-8076753736 [email protected]

-->

Gravitation

Question

Wired Faculty App

Two planets are revolving around the earth with velocities v₁ and v₂ and in radii r₁ and r₂ ( r₁ > r₂ ) respectively. Then :

v₁ = v₂

v₁ > v₂

v₁ < v₂

$\frac{v_{1}}{r_{1}} = \frac{v_{2}}{r_{2}}$

Solution

B.

v₁ > v₂

$Orbital velocity v = \sqrt{gr} \frac{v_{1}}{v_{2}} = \sqrt{\frac{r_{1}}{r_{2}}} As r_{1} > r_{2} so v_{1} > v_{2}$

Some More Questions From Gravitation Chapter

Which of the following statements is correct?
(a) Centre of the mass of a body always coincides with the centre of gravity of the body.
(b) Centre of the mass of a body is the point at which the total gravitational torque on the body is zero
(c) A couple on a body produce both translational and rotational motion in a body.
(d) Mechanical advantage greater than one means that small effort can be used to lift a large load.

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will:

Two 20 g flatworms climb over a very thin wall, 10 cm high. One of the worms is 20 cm long, the other is wider and only 10 cm long. which of the following statement is correct regarding them?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation