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When a newton's disc is rotated at a very high speed , why do the colours mix up and finally appear white??? ...

*Image* A spool of radius 100m and mass 100kg has 100 grooves of radii 1m, 2m, ..., 100m. We use pulleys to suspend masses from the grooves as shown. The mass (i)kg is associated with the groove of radius (100i)m. Find the a ...

Find the accln of the block of mass M shownin the figure . The coefficient of friction between the 2 blocks is μ1 and that between the bigger block and ground is μ2 *Image* ...

Imagine a flat earth extending to infinity in all directions.How thick should the earth be to have the same gravity at the surface as we have now? Density=5515 kg/m3 and g=9.81m/s2 ...

*Image* If R1 = 3 ohm R2 = 2 ohm R3 = 7.5 ohm R4 = 5 ohm R5 = 5 ohm R6 = 10 ohm R7 = 20 ohm Find the equivalent resistance between A and B. ...

If voltage is a scalar quantity, how can it be negative? Thanx in advance... ...

Work, energy, potential etc. are all scalar, but they can have negative values too. How can scalar be negative? They should neither be positive nor be negative as they are independent of the direction. P.S.: W=FScosΘ; F=vect ...

A metallic ball is suspended by an insulated string, in an uniform electric field. A XRay of high radiation is passed through the ball in the field. What will happen to the ball? ...

A Van is standing on a frictionless portion of a horizontal road. to start the engine, the vehicle must be set in motion in the forward direction. how can the person sitting inside the van do it without coming out and pushing ...

THE DEACCELERATION EXPERIENCE BY A MOVING MOTOR AFTER ITS ENGINE IS CUT OFF IS GIVEN BY dv/dx=kv3 where k is constant if v0 is the magnitude o velocity of cut off, find te magnitude of velocity at time t after the engine is ...

A filled water bottle is lying on the ground. You pick it up and put it on a table which is at some height from the ground. Thus the potential energy of the bottle increases. Does the internal energy of the water molecules in ...

A small bar starts sliding down an inclined plane forming an an angle α with the horizontal.The friction coefficient depends on the distance x covered as μ=Kx where K is a constant.Find the distance covered by the bar till ...

*Image* A block of mass M/2 is kept over another block of mass M and the heavier block is kept over smooth horizontal surface.The heavier block is long enough such that the smaller block does not fall during subsequent motion ...

*Image* As the cavities are vacuum,so there will be no gravitational forces bet. them,and as d gas expands,they will simply move apart from each other? ...

Sir, please answer this with reason A conducting ring of radius 1m is placed in a uniform magnetic field of 0.01T oscillating with frequency 100 Hz with its plane at right angles to B. What will be the induced electric field ...

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2 circular coils A and B with different number of turns are placed at some separation (say d) apart in the same plane. They carry currents I1 and I2 respectively which are maintained. The coefficient of mutual induction for t ...

If image distance is 20 cm and object distance is 40 cm ,then how much is the radius of the curvature? ...

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Can anyone please show the derivation of F = qvBSin(theta)? Please use graphs to explain,and clearly state what is being done in each step to derive the final equation. ...

*Image* A line of charge L=10^6C/m is fixed on the rim of a wheel of radius R=1m,which is then suspended horizontally,so that it is free to rotate(the spokes are made of wood).In the central region up to radius a=1/2m,there ...

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Sir, please help me clear this query of mine. When we say that there is an inductor of inductance 'L', is it supposed to mean the inductance of the inductor at a particular instant is 'L' or does it mean that it is the value ...

(1)Why is sunlight yellow? (2)why does sky appear blue?by combining voilet,blue and indigo,we are supposed to get a darker blue,ryt???? ...

A uniform shell explodes into 3 equal parts . 2 of the parts fly off perpendicular to each other with velocities 9 & 12 m s 1 . Find the velocity of the third part ...

A non conducting ring of mass m and radius R has a charge Q distributed over its circumference.It is placed on a rough horizontal surface such that the plane of the ring is parallel to surface.A vertical mag. field B=B0t2is s ...

Sir how to approach. *Image* ...