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Two simple harmonic waves are represented respectively by yi = Ai sin wt and y2= A2cos wt. The phase difference between the two waves is

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A river is flowing west to east at a speed of 5 m/min. A min on the south bank of the river, capable of swimming at 10m/min in still water, wants to swim across the river by the shortest path. He should swim in the direction

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Dimension of surface energy is

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The terminal velocity of a small sized spherical body of radius r falling vertically in a viscous liquid is given as one of the following proportionality with radius.

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A constant torque acting on a uniform circular wheel changes its angular momentum from L0 to 4L0 in 4 seconds. The magnitude of this torque is

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At what temperature the rms velocity of a hydrogen molecule be equal to that of oxygen at 47°c?

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Dimension of the change in entropy is

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A square plate of side 2 units is heated through 10°C. If the linear expansivity of the material is x, increase in the surface area of the plate is

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A black body radiates heat energy at the rate of 2 × 10 Jsn m’ at a temperature of 127° C. The temperature of the black body at which the rate of heat radiation is 32 × 105 Js-1 m2 is

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A ray of light in air enters a glass slab. Its

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