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A block of mass 2 kg is placed on the floor (ΞΌ = 0.4). a horizontal force of 7 n is applied on the block. the force of friction between the block and floor is

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A current of 1.40 ampere is passed through 500mL of 0.180M solution of zinc sulphate for 200 seconds. The molarity of Zn2+ ions after deposition of zinc is:

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Three charges q, q and q are placed at the vertices of an equilateral triangle of side l as shown in the figure. if the net electrostatic energy of the system is zero, then q is equal to

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Two resistors whose value are in ratio 2:1 are connected in parallel with one cell. Then ratio of power dissipated is

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Consider a uniform square plate of side a and mass m. The moment of inertia of this plate about an axis perpendicular to its plane and passing through one of its corner is:

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The value of acceleration due to gravity β€²gβ€², at earth's surface is 10m/s2. Its value at the centre of the earth which is assumed to be sphere of radius β€²Rβ€² and uniform mass density, is

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Friction does not depend on the nature of the surface in contact.

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Let ar and at represent radial and tangential acceleration . the motion of particle may be circular if : ( assume that only momentary rest is allowed) A. ar = at = 0 B. ar = 0 and at≠0 C. ar ≠ 0 and at=0 D.ar≠ 0 and at≠0

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Two circular, similar, coaxial loops carry equal currents in the same direction. If the loops are brought nearer, what will happen?

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The displacement of a particle is given by x=(tβˆ’2)2 where x is in metres and t is in seconds. The distance covered by the particle in first 4 seconds is

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