Recently Active Physics Questions

A man travelling in a fast moving train watches the nearby objects moving in the opposite direction, but the distant objects appear to be stationary. WHY??? ...

what is the use of first slit(barrier slit) in YDSE? ...

can anybody plzz help me in these typo questions... 1)a police jeep is chasing a culprit going on a motorbike. the motorbike crossess a turning at a speed of 20m/s the jeep follows it at a speed of 25m/s ,crossing the turning ...

2 metal spheres of radii a and b are connected by a thin conducting spheres.There sep is very arge compared to there dimensions. Find the equivalent capacitance of the system. Since they are connected by a wire so the two sph ...

*Image* Two blocks of mass m lie on smooth table having reflecting surfaces AB and CD.An object O is placed b/w them and system is released.Find acc. of one image wrt other. Ignore friction ans: 7g/16 ...

A thin uniform metallic rod of length 0.5 m and radius 0.1 m rotates with an angular velocity 400rad/s in a horizontal plane about a vertical axis passing through one of its ends. Calculate the tension in the rod as a fucntio ...

A tank is filled with water to a depth of 1m. A hole of cross section 1 cm^2 at the bottom allows the water to drain out. At what distance below the hole the cross sectional area of the stream is 0.9 times the area of the hol ...

A smooth sphere A of radius R and mass M, collides elastically and head on with an identical sphere B at rest. The entire system is on a smooth horizontal ground. Given that the sphere A was rolling without slipping with an a ...

What is the mean pressure exerted by a fluid on the walls of a container of height h? ...

prove \int_{0}^{\infty}{\frac{x^3}{e^x-1}\mathrm{dx}}=\frac{\pi^4}{15} ...

We know that drift speed of electrons in a conductor is given by v=l/t ,where l is the displacement and t is the time taken. In H.C. Verma it is written that as t decreases v decreases.How can this be true? ...

Can any one explain me relative motion? I tried studying it from comprehensive but I could not follow. Please help...... ...

Q Atuning fork of frequency 340 Hz is sounded above a cylindrical tube 1m high. water is slowly poured into the tube . if the speed of sound is 340m/s at what levels of water in the tube will the sound of fork be appreciably ...

capacitors with capacity 2 , 4 , 8 ..............∞ (all in micro farads) are arranged in series combination... wt is the equvalent capacitance? ...

1) A student says that he had applied a force F = - k√x on a particle and the particle moved in SHM. He refuses to tell whether k is constant or not. assume that he has worked only with positive x axis and no other forces a ...

A horizontal tube, open at both ends, contains a column of liquid. the length of the liquid column does not change with temperature. Let γ = coefficient of volume expansion of the liquid and α= coefficient of volume expansi ...

a point charge charge q is rotated along a circle in the electric field generated by another point charge Q. the work done by the electric field on the rotating charge in one complete revolution is (a) zero (b) positive (c) n ...

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These are not doubts - I am just looking for simpler ways to solve these :- 1 > Given two plain - parallel electrodes , at a distance " d " , and kept at voltages " 0 " and " V0 " , find the magnetic field per unit length ...

1)Can simple harmonic motion take place in a non inertial frame? If yes, should the ratio of the force applied with the displacement be constant? 2)Can a potential energy in a SHM be negative? Will it be so if we choose zero ...

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1.) A chain of mass M and length L is suspended vertically with its lower end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of the chain has fallen? Neglect t ...

wt are the factors responsible for radioactivity seen in heavier nuclei , why not in lighter nuclei having most unstable nucleis???? ...

wt is the basic concept behind nuclear forces means their cause of origin??? ...

beta particles are emitted from nucleus but are negatively charged.how? ...

what are anti-neutrino particles??? ...

A boy throws a ball at an angle 450 with the horizontal at t = 0 at origin. Path of the ball follows the trajectory y = x – 5x2. The boy start running with a constant velocity 1 m/s along x-axis at t = 0. Take g = 10 m/s2. ...

A ball looses 15% of its KE after it bounces off a concrete slab . What is the speed with which one must throw it vertically down frm a height of 12.4 m to hav it bounce back to the same height?? ...

*Image* this is an series terminated by capacitor c. what value of c will make the contribution in equivalent capacity b/w a & b of series of capacors within the dots uneffective??? ...

the bullet is fired from the rifle which recoils after firing. The ratio of the kinetic enegy of the rifle to that of the bullet is : (a) zero (b) one (c) less than one (d) more than one ...