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a piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. from the teacher perspective, the chalk appears to fall

Physics : Optics

Obtain expressions for reflection and transmission amplitude coefficients when

electric vector associated with a plane monochromatic electromagnetic wave is in the

plane of incidence.

electric vector associated with a plane monochromatic electromagnetic wave is in the

plane of incidence.

Physics : Optics

An atomic system consisting of two energy levels, with population of higher energy level less than that of the lower level, is in thermal equilibrium. Show that the absorption of radiation dominates stimulated emission if radiation of appropriate frequency is introduced into the system. Comment on the consequences of this fact for laser action.

Physics : Other

A star destroyer of mass 12255 kg carries a tie fighter of mass 547 kg travels at a speed 345 m/s to the right. The tie fighter launches to the right and afterwards the star destroyer is moving backwards at a speed of -25 m/s. How fast did the tie fighter launch?

An automobile travelling at 80 km hrâˆ’1

has tyres of radius 80 cm. On applying brakes,

the car is brought to a stop in 30 complete turns of the tyres. What is the magnitude of

the angular acceleration of the wheels? How far does the car move while the brakes are

applied?

has tyres of radius 80 cm. On applying brakes,

the car is brought to a stop in 30 complete turns of the tyres. What is the magnitude of

the angular acceleration of the wheels? How far does the car move while the brakes are

applied?

A simple harmonic motion is represented by tatxw=cos)( Obtain expressions for velocity and acceleration of the oscillator. Also, plot the time variation of displacement, velocity and acceleration of the oscillator.

What should be the radius of a space station spinning with an angular speed of 2 rpm such that an astronaut inside the station experiences artificial gravity with g = 10 ms-2?

A pendulum bob of mass 50 g is suspended on a string from the ceiling of an elevator which is moving downwards with an acceleration 1.5 ms-2. Draw the free body diagram using the non-inertial frame of reference and determine the tension in the string. (Take g = 10 ms-2)

A satellite going around Earth in an elliptic orbit has a speed of 10 km s-1 at the perigee which is at a distance of 227 km from the surface of the earth. Calculate the apogee distance and its speed at that point.

A proton undergoes a head on elastic collision with a particle of unknown mass which is initially at rest and rebounds with 16/25 of its initial kinetic energy. Calculate the ratio of the unknown mass with respect to the mass of the proton.