Class 9

Science

Physics

Gravitation

Buoyant Force is the upward force that acts in the direction opposite to that of weight.Type 1 for true and 0 for false

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The figure shows elliptical orbit of a planet m about the sun S. the shaded area SCD is twice the shaded area SAB. If $t_{1}$ be the time for the planet to move from C to D and $t_{2}$ is the time to move from A to B, then:

Archimedes' principle states that the buoyant force applied to an object

A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is $20m$. The speed of the car at the top of the hill is between

A comet orbits the sun in a highly elliptical orbit. Does the comet have a constant (a) Linear speed, (b) angular speed, (c) Angular momentum, (d) Kinetic energy, (e) potential energy, (f) total energy throughout its orbit? Neglect any mass loss of the comet when it comes very close to the Sun.

A balloon filled with hydrogen rises in air. explain the reason.

A uniform ring of mass m is lying at a distance $3 $ a from the centre of mass M just over the sphere (where a is the radius of the ring as well as that of the sphere). Find the magnitude of gravitational force between them .