Recently Active Physics Questions

Consider a planet whose mass and radius is half of the earth,and the surface temperature is abt 800K,Can we predict whether oxygen is in the planet's atmosphere ...

*Image* The acceleration a of the supporting surface required to keep the centre G of the circular cylinder in a fixed position during the motion if there is no slipping between the cylinder and the support will be :_________ ...

Suppose we have a rotating horizontal disc . A man stands at the edge of the disc. We say that the net moment of inertia of the system is MR2/2 + mR2 where M is the mass of the disc and m is of the man. Then my statement is T ...

A block of mass M travelling at velocity v m/s strikes on a spring of mass m on a horizontal table. Find the maximum compression. ...

*Image* Loads of 2kg and 10 kg are hanging from an ideal thread over a smooth pulley. The system is in equilibrium...when a monkey weighing 8kg starts climbing up from the given position at time t=0 with an acceleration 2m/s2 ...

A body is floating in a vessel filled with liquid.now the vessel is heated.the buoyant force on the body incr/decr/remains same?? ...

Does Gauss law for electric flux hold, in case of induced electric field due to time dependent magnetic field in a cylindrical region? Is it the case that Gauss law for flux holds in conservative electric fields only??? a bit ...

Is it possible to have a spherical drop of water that could evaporate without absorbing heat or losing internal thermal energy? Given data: Surface tension of water: 0.073 N/m Density of water: 1000 kg/m3 Latent heat of evapo ...

A solid body X of heat capacity C is kept in a an atmosphere whose temperature is TA = 300 K. At time t = 0, the temperature of X is T0 = 400 K. It cools according to Newton’s law of cooling. At time t1 its temperature is f ...

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Suppose a hollow sphere is taken. The Sphere is now filled with a non-viscous fluid. What is the change in the Rotational Kinetic Energy ?? ...

i created this for those who want to revise old chapters..............admins plzzz take pains to create a sub topic named revision.....yeah gravitation is my second best chapter......y not start with it??????????? ...

IF TWO BLOCKS GLUED TOGETHER ARE ATTACHED TO A SPRING & ONE OF THEM FALLS INSTANTANEOUSLY ,,,,,,,,,,,THEN FIND AMPLITUDE OF OSCILLATION OF FIRST *Image* ...

a point source of constant power is brought from infinity 2wards adisc along its axis.P is apoint on the axis.Radiation pressure at P 1st increases den decreases.Why? ...

Can centripetal/centrifugal forces be never applied to bodies on earth ? ...

Can we always assume g varies with height as g'=g(1- 2h/r ) ??? ...

A man standing on a platform holds weights in his outstretched arms. The system is rotated about a central vertical axis. If the man now pulls the loads inwards close to his body, then : A) angular vel. of the sys. will incre ...

A solid homogeneous sphere is moving on a rough horizontal surface partly rolling and partly sliding. During this kind of motion of the sphere : A) total K.E of the sphere is conserved B) angular momentum of the sphere about ...

*Image* Plz explain how to do this ...

Is it easy to melt one cube of ice in isolation or a few cubes placed in contact with each other?? ...

r represents the pos vector of a particle and ω and a are non zero contants (contant mag includes a zero mag) A)r=cos(ωt)i +sin(ωt)j + (at)k B)r=5cos(ωt)i +5sin(ωt)j C)r=(5at2)i +(2at)j D)r=5[cos(ωt2)i +sin(ωt2)j] p)co ...

If the error in measuring momentum is +100%,then the error in measurement of kinetic energy is : a>400% b>300% c>100% d>200% ...

The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to I/8. The thickness of lead which will reduce the intensity to I/2 will be ? ...

*Image* Doubt is that must E always be greater than vBl Although it has mentioned v is small, but B and l may be large enuf to be greater than E, So the answers will differ. IS my logic correct? ...

*Image* A cat starts from a point A and heads straight for a point P with a constant speed v, while at the same instant a dog starts running after after the cat with a constant speed u from a point B such that his velocity is ...

*Image* the orange dot is the center of the cube and its the origin the charge is at the point (2a,0,2a) ...

Half lives of two uranium samples U238 and U235 are known to be 4.5 *10^9 and 7.1*10^8 yr ,respectively .if the earth was formed with equal amts of the two isotopes estimate the current age of the earth given that uranium ore ...

the sum is there is a point charge of +2.4 micro C located at the origion..... find the work done in displacing a 2nd pnt charge of q=4.30micro C from x=0.150 y=0 to x=0.250 to y=0.250 my doubt is that we can first easily sov ...

sorry dudes but i am posting a lot of questins these days it is due to phyiscs olympaid which is on sunday Mercyry is poured into a you tube in which the cross sectional area of the left limb is 3 times smaller than the right ...

If c is positive and 2ax^2 + 3bx +5c=0, does not have any real roots, then prove that 2a-3b+5c>0. ...