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Two waves represented by y = a sin (ωt − kx) and y = a cos (ωt − kx) are superimposed. The resultant wave will have an amplitude

A capacitor of capacitance C has charge Q and resultant energy stored in it is W. If the charge on its plates is increased to 2Q, the stored energy would be

v - t graph of a particle moving along x-axis is given. Its velocity-position graph if it starts from origin is

A shell of mass 20kg at rest explodes into two fragments whose masses are in the ratio 2:3 . The smaller fragment moves with a velocity of 6m/s . The kinetic energy of large fragment is

A uniformly charged thin spherical shell of radius R carries uniformly surface charge density of σ per unit area . Give expression of Electrical field

If one body is at 50 degree Celsius and other is at 60 degree Celsius. Then which will reach temperature of surrounding (25 degree Celsius) early? I know 60 degree has more rate of cooling but will it also reach equal to surrounding temp quickly as rate will decrease as temp decrease

A boat is moving with a velocity 3^i+4^j with respect to ground. The water in the river is moving with a velocity −3^i−4^j with respect to ground. The relative velocity of the boat with respect to water is

The equation of a wave disturbance is given as y =Asin(2pi+kx ).if velocity is 100m/s then the value of propogation constant

A man moves on a straight horizontal road with a block of mass 2 kg in his hand. If he covers a distance of 40 m with an acceleration of 0.5 m/s2, find the work done by the man on the block.

a heating coil takes 8 mins to boil a quantity of water electrically.now the heating coil is cut into two equal parts which are joined in parallel to each other.find the time this parallel combination will take to heat the some quantity of water

What is the correct formula of vector form of coulombs law

45.A ladder is resting with a wall at an angle of 30^° a man is ascending the ladder at the rate of 2 feet per second is rate of approaching the wall is

27.Molar H(Enthalpy), Molar(Internal Energy), Molar Mass, Specific heat capacity are which properties? Extensive or Intensive?

The threshold wavelength for photoelectric effect of a metal is 6500 ∘A. The work function of the metal is approximately

29.A particle is moving along the x-axis with acceleration a=-1/2x². At time t=0 it is at x= 1.0m and its velocity is v=0. Its velocity when it reaches x=0.50 m is (1) - 1î (2) - 2î (3) +1î (4) +2î

Describe picometer

A charge Q is to be divided between two objects. What should be the values of the charges on the objects so that the force between the objects can be maximum?

A spherical shell of radius R is rolling down an incline of inclination θ without slipping as shown in figure. Find the minimum value of coefficient of friction.

nt200calorie heat required to raise the temprature of diatomic gas at constant pressure by 10degree celcius. calculate amount of heat required to raise temprature of same gas by 30degree celcius at constant volume.n

A metal ball immersed in alcohol weighs W1at 0°C andW2 at 59°C. The coefficient of cubical expansion of the metal is less than that of alcohol. Assuming that the density of metal is large compared to that of alcohol, it can be shown that

If momentum is increased by 10%then kinetic energy will increase by?

A hollow sphere of volume V is floating on water surface with half immersed in it. What shouldwater poured inside the sphere so that the sphere now sinks into the wate(2) V/3(3) V/4(4) V

A smooth sphere of mass 'M' moving with velocity 'u' directly collides elastically with another sphere of mass 'm' at rest. After collision their final velocities are 'V' and 'v' respectively. The value of 'v' is

A block of mass 250g slides down an incline of inclination 37 degree with a uniform speed. Find the workdone against the friction as the block slides through 1m.

13.A pump ejects 12000kg of water at speed of 4m/s in 40second. Find the average rate at which the pump is working

A particle is projected under gravity at an angle of projection 45∘. If for ground projectile motion its range is 36m. Find maximum Height attained by particle in S I units is

The Froude number of flow in a rectangular channel of width 2 m is 0.7. If the depth of flow is 1.2 m, the critical depth of flow is ____ m.0.9

22. An iron bar of (K is 79W mK )and a brass bar (K is 109W mk) both of equal length and area of 0.1m and 0.02m2 respectively are soldered end to end. The free ends of iron bar and brass bar are at 373 k and 273k respectively. Obtain equivalent thermal conductivity of the compound bar.

Two resistors of resis†an ce 300ohm and 600 ohm at 0^0C have thermal coefficient of resistance α and 3 α. They are connectef in parallel then equivalent thermal coefficient of resistance

a train is moving with uniform accelaration .the 2 ends of the train pass through a point on the track with velocity v_{1 }and v_{2 } with what velocity the middle point of the train would pass through the same point

A particle is moving along a circular path. The angular velocity, linear velocity, angular acceleration, and centripetal acceleration of the particle at any instant respectively are →ω,→v,→αand →ac. Which of the following relations is not correct?

30. No.of significant figures in the following- 9.100 9.100cm 0.09 9 09cm (1)2*X1-X2/6 (2)X1-X2 (3)3*X1-X2 (4)X1-3*X2

The frequency of oscillations of mass m suspended by a spring is v1 if length of spring is cut to one third then the same mass oscillated with frequency v2 then

A vertical wire carries a current in upward direction. An electron beam sent horizontally towards wire will be deflected.

A composite rod of wood &amp; iron is rotating about a fixed axis 'A' with an angular velocity of ω. The lengths of the wood and iron portions is l each. Find the emf induced across the iron rod.

If ^i−3^j+5^k bisects the angle between ^a and −^i+2^j+2^k, where ^a is unit vector, then ^a=

Nichrome and copper wires of the same length and same radius are connected in series. If a current I flows through them, which wire gets heated up more?

Ram stands at a distance of 15 meters from a plane mirror and sees his image. Find out the distance between Ram and his image.

In a double slit experiment, the two slits are 1 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern?

positive charhe Q is distributed uniformly over a circular ring of radius R. aparticle having mass m and negative charge q,is placed on the axis at a dis†an ce of x from the centre of the ring.Find the force on the particle assuming x

The sum of 436.32,227.2 and 0.301 in appropriate significant figures is

A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g3, the fraction of volume immersed in the liquid will be

The number of particle crossing per unit area perpendicular to Z axis per unit time is given by N=-D(N2-N1)/(Z2-Z1), where N2 and N1 are the number of particle per unit volume at Z2 and Z1 respectively. What is the dimensional formula for D?

what do we mean by impulse ?

A convex mirror used for rear view on an automobile has a radius of curvature of 3.00 m. If a bus is located at 5.00 m from this mirror, find the position, nature and size of the image.

If acceleration of A is 2 m/s2 which is smaller thanacceleration of B then the value of frictional forceapplied by B on A is

Two positive charges of magnitude q and 4q are situated at points (0,0) and (3,0) [ coordinates are in cm] the net electric field due to charge system at point (3cm , 4cm) is

30. No.of significant figures in the following- 9.100 9.100cm 0.09 9 09cm (1)2X1-X2/6 (2)X1-X2 (3)3X1-X2 (4)X1-3*X2

A composite rod of wood & iron is rotating about a fixed axis 'A' with an angular velocity of ω. The lengths of the wood and iron portions is l each. Find the emf induced across the iron rod.