A wheel is rotating at 900 rpm about its axis.When the power is cut-off it
A wheel is rotating at 900 rpm about its axis.When the power is cut-off it comes to rest in 1 min.The angular retardation in rad s⁻² is
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(a) 𝜋 / 2 (b) 𝜋 / 4 […]
Physics
The mean radius of the earth is R, its angular speed on its own axis is ?
The mean radius of the earth is R, its angular speed on its own axis is ? and the acceleration due to gravity at earth’s surface is g.What will be the radius of the orbit […]
The escape velocity from the earth’s surface is 11 kms⁻¹.A certain planet
The escape velocity from the earth’s surface is 11 kms⁻¹.A certain planet has a radius twice that of the earth but its mean density is the same as that of the earth.The value of the […]
Imagine a light planet revolving around a very massive star in a circular
Imagine a light planet revolving around a very massive star in a circular orbit of radius R with a period of revolution T.If the gravitational force of attraction between the planet and the star is […]
Two balls of mass m₁ and m₂ are separated from each other by powder charge
Two balls of mass m₁ and m₂ are separated from each other by powder charge placed between them.The whole system is at rest on the ground.Suddenly, the powder charge explodes and masses are pushed part.The […]
A flywheel rotating about a fixed axis has a kinetic energy of 360 J when
A flywheel rotating about a fixed axis has a kinetic energy of 360J when its angular speed is 30 rads⁻¹.The moment of inertia of the flywheel about the axis of rotation is
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The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity
The velocity of a particle at an instant is 10 ms⁻¹ and after 5 s the velocity of the particle is 20 ms⁻¹.The velocity 3s before in ms⁻¹ was
Options
(a) 8 ms⁻¹ (b) 4 […]
Two bodies of masses m₁ and m₂ are initially at rest at infinite distance apart
Two bodies of masses m₁ and m₂ are initially at rest at infinite distance apart.They are then allowed to move towards each other under mutual gravitational attraction with the escape velocity .Their relative velocity of […]
Two bodies of masses m₁ and m₂ and having velocities v₁ and v₂ respectively
Two bodies of masses m₁ and m₂ and having velocities v₁ and v₂ respectively , moving along a straight line are brought to rest by equal resistances forces.If one moves twice as that of the […]
A particle moves from position r₁ = 3i + 2j -6k to position r₂ = 14i + 13 j+ 9 k
A particle moves from position r₁ = 3i + 2j -6k to position r₂ = 14i + 13 j+ 9 k under the action of force (4 i + j + 3k)N. The work done […]