Physics Test 12...

A point object moves on a circular path such that distance covered by it is given by function  Meter (t in second). The ratio of the magnitude of acceleration at t = 2 sec. And t = 5 sec. is 1: 2 then radius of the circle is

At time t = 0, a 2 kg particle has position vector m relative to the origin. Its velocity is given by  The torque acting on the particle about the origin at t = 2s, is :

A box is floating in the river of speed 5m/s. The position of the block is shown in the figure at t=0. A stone is thrown from point O at time t = 0 with a velocity  Find the value of v₁, v₂ such that the stone hits the box.

A luminous point object is moving along the principal axis of a concave mirror of focal length 12 cm towards it. When its distance from the mirror is 20 cm its velocity is 4 cm/s . The velocity of the image in cm/s at that instant

A uniform electric field E is present horizontally along the paper throughout the region and uniform magnetic field B₀ is present horizontally (perpendicular to plane of paper in inward direction) right to the line AB. A charge particle having charge q and mass m is projected vertically upward and it crosses the line AB after time t₀. Find the speed of projection if particle moves with constant velocity after t₀ . (Given qE = mg)

Two blocks P and Q are connected by a light inextensible string passing over a smooth pulley fixed as shown in the Figure. The coefficient of friction of blocks P and Q to the table is μ = 0.3; the mass of the block Q is 20 kg. The mass of the block P for the block just to slip is

A monochromatic light source of wavelength λ is placed at S. Three slits S₁, S₂ and S₃ are equidistant from the source S and the point P on the screen. S₁P-S₂P=λ/6 and S₁P-S₃P = 2λ/3. If I be the intensity at P when only one slit is open, the intensity at P when all the three slits are open is

On a hypothetical planet satellite can only revolve in quantized energy level i.e. magnitude of energy of a satellite is integer multiple of a fixed energy. If two successive orbit have radius R and 3R/2 what could be maximum radius of satellite

In a transistor amplifier when the signal changes by 2 V, the base current changes by 150 μA and collector current by 15 mA. If collector load Find the voltage gain of amplifier.

Copper and iron wires of same length and diameter are in series and connected across a battery. The resistivity of copper is about one-sixth of the iron. If E₁ and E₂ are the electric fields in the copper and iron wires respectively, then which of the following is correct?