IFS (Forests Services) Physics (Mains): Questions 12  16 of 34
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Question number: 12
» Classical Mechanics » Particle Dynamics » Rotating Frames
Appeared in Year: 2013
Write in Short
A satellite revolves in a circular orbit around the Earth at a certain height above it. Calculate the time period of revolution of the satellite, if the radius of the Earth is significantly higher than the height at which the satellite revolves. (Section A)
Question number: 13
» Special Relativity, Waves & Geometrical Optics » Waves » Damped Oscillation
Appeared in Year: 2013
Write in Short
A block of mass is attached to one end of a combination of two massless springs connected in series. The other end of the combination is fixed to a rigid support. The spring constatnts of the two springs are and , respectively. The block is free to move on a frictionless horizontal surface. If the block is pulled a little and then released, calculate the frequency of oscillation of the block. (Section A)
Question number: 14
» Thermal and Statistical Physics » Statistical Physics » BoseEinstein Condensation
Appeared in Year: 2012
Describe in Detail
What are Einstein’s A and B coefficients? Establish a relation between the. (Section A)
Explanation

There are three Einstein coefficients associated with any pair of energy levels. Of these three only one is independent. The other two dependent upon the coefficient taken to be independent, plus the frequency of the transition and the statistical weight of the two associated terms.
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Question number: 15
» Classical Mechanics » Particle Dynamics » Conservation of Linear and Angular Momentum
Appeared in Year: 2010
Describe in Detail
Establish the relation between the angular momentum and torque of a particle. Show that this relation leads one to the principle of conservation of angular momentum. (Section A)
Explanation

Angular momentum is a measure of body is given by the cross product of linear momentum and position vector from the axis of rotation.
Where, is distance from the axis of rotation and the is the linear momentum of the body.

Torque is defined as a moment of force or tendency of a for
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Question number: 16
» Special Relativity, Waves & Geometrical Optics » Geometrical Optics » System of Two Thin Lenses
Appeared in Year: 2010
Describe in Detail
Consider a system of two thin lenses of focal lengths and separated by a distance of in air. For an object of height placed at a distance of in front of the convex lens, find the size and position of the image. (Section A)
Explanation

Image from first lens is given as,
 Now, the distance between lenses is
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