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Two blocks of masses 6 kg and 4 kg are placed on a frictionless surface and connected by a spring. If the heavier mass is given a velocity of 14 m/s in the direction of lighter one, then the velocity gained by the centre of mass will be
If the body is moving in a circle of radius r with a constant speed υ, its angular velocity is
For a coil having L=2 mH, current flows at the rate of 10⁻3 ampere/sec. The emf induced is
The resistance of a coil is 4.2 Ω at 100oC and the temperature coefficient of resistance of its material is 0.004/oC. Its resistance at 0oC is
The curve drawn between velocity and frequency of photon in vacuum will be a
Two insulated matallic spheres of 3 μ F and 5 μ F are charged to 300V and 500V respectively. The energy loss when they are connected by a wires is...
A wire of radius r has resistance R. If it is stretched to a radius of 3r/4, its resistance becomes
Air is filled at 60oC in a vessel of open mouth. The vessel is heated to a temperature T so that 1/4th part of air escapes. Assuming the volume of the vessel remaining constant, the value of T is
A cyclotron oscillator frequency is 10 MHz. If radius of its dees 60 cm, then magnetic field for accelerating the protons is (Given e = 1.6 x 10-19C, mp = 1.67 x 10-27 kg)
A magnetic needle suspended by a silk thread is vibrating in the earth's magnetic field. If the temperature of the needle is increased by 700oC, then
The M.I. of a rectangular lamina perpendicular about its centre of mass is
A particle of mass m is projected with velocity υ making an angle of 45o with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)
A particle of mass m is projected with velocity υ making an angle of 45o with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)