Recently Active Physics Questions

Q. An electron in the ground state of the He atom joins the Helium nucleus to form He+ ion. Assuming that electron had zero kinetic energy after the transition, find the wavelength of the photon emitted. ...

can somebody explain or give link to study polar cordinates as it is useful to find velocit etc. suppose a rod is leaning against the wall with the rod beimg almost vertical then find the angle at which it shall leave contact ...

1.A point charge Q is located on the axis of a disc of radius R at a distance a from the plane of the disc.If 1/4th of the flux from the charge passes through the disc,then find the relation between a and R..... seems pretty ...

I saw that last date for enrollment is 15th September.. But How do I enroll my self in case my school is not registered with them? It say "You must register from your OWN School / College." Does it mean that they have sent an ...

1) a shell of mass m is fired from a gun of mass km which can recoil freely on a horizontal plane , the elavation of the gun is 45° .prove that the ratio of energy of the shell to that of the gun is (2k2+2k+1)/k . [ im getti ...

A horizontal straight wire 10 m long extending from east to west is falling with a speed of 5.0 m / s, at right angles to the horizontal component of the earth’s magnetic field, 0.30 × 10−4 Wb / m2. (a) What is the direc ...

if three identical particles are placed on the vertices of an equilateral triangle...will the grav field at the centroid of the triangle be zero??.....i guess the answer is a big NO...bt sumwhr i read that its zero....just wa ...

A particle is suspended vertically from a point O by an inextensible massless string of length L. A vertical line AB is at a distance L/8 from O as shown in figure. The object is given a horizontal velocity u. At some point , ...

Consider the two problems. 1)A perfectly reflecting solid sphere of radius r is kept in the path of a parallel beam of light of large aperture. If the beam carries an intensity I,find the force exerted by the beam on the sphe ...

where will i get 3rd sem results? ...

a charged particle of mass 2 kg and chrge 2 C is projected with velocity v = 8i + 6j m/s in horizontal plane and there if magnetic field 2k (k cap) find the coeff of friction such that the particle travels in spiral path b4 c ...

1. 3 identical balls moving together along a horizontal line with velocity v collide with 2 similar balls at rest along the same line. The collision is elastic. After the collision a. 2 balls move with vel. v b. 2 balls move ...

Q1 > A particle of mass 'm' is moving in a circular path of constant radius 'r' such that its centripetal acceleration 'a' is varying with time as a=k*k*r*t*t, where 'k' is a constant. Find the power delivered to the parti ...

*Image* QUESTION: Find equivalent resistance between A and B. ...

*Image* Two identical ladders ,each of mass M and length L are resting on the rough horizontal surface as shown in figure. A block of mass m hangs from P . If the system is in equilibrium , find the magnitude and direction of ...

The potential energy of a 1 kg particle free to move along X-axis is given by U(x)=( x4/4 - x2/2 ) J.The total mechanical energy of the particle is 2 J. Then the maximum speed (in m/s) is p/√q . Find out p + q. I got 2 answ ...

(1) The work function of a certain metal is 3.31×10–19 J. Then the maximum kinetic energy of photo electrons emitted by incident photons of wave length 5000 Ǻ is (given h = 6.62×10–34 Js, c = 3×108 ms–1, e = 1.6×10 ...

A plank of mass 'M' is placed on a smooth surface and a cylinder of mass 'm' and radius 'R' placed over the plank. now there is a horizontal force 'F' acting on the plank towards right. if the cylinder does not slip over the ...

A CHARGE q is istributed uniformly over a large plastic plate.The electric feidl at point P,which is near the centre is 10V/m.Now the plate is replaced bya copper one and all the conditions of the previous problem are exact. ...

Displacement of a particle in one dimension under action of a constant force is related to time t by eq. t= x +3 where x is in m and t in sec. a> Find the displacement of a particle when its velocity is 0. ...

a balloon of mass m is found to accelerate up at the rate of g/6. the quantity of water that should be put inside the balloon so that it may accelerate downwards at the rate of g/6 is: ...

a uniform disc of radius R is first spinned to ang velocity 'w'. and the placed with its flat face on the horizontal surface. how long will the disc be rotating if the friction coeff = 'u'. ...

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The mass of a square plate of side length ' 2l ' is ' M '. A semi circular portion is cut off and placed as shown. Find the COM of the resulting distribution. *Image* Fast plz! ...

A particle moves along the x - axis according to the law x = a cos ωt. Find the distance that the particle covers during time interval from t = 0 to t = t. HELP! ...

The Relation Between velocity (V) and displacement (x) is given by V=k(a2-x2) Where, k=konstant a=konstant Find the position at the end of 3 seconds ?...... ...

A solid sphere of radius R is charged uniformly.At what distance from its surface is the electrostatic potential half of the potential at the centre? 1) R 2) R/2 3) R/3 4) 2R I know the final answer.But how to solve this one? ...

1> if y represents mass and x represents velocity then dimensional formula for d3y/dx3 will be? 2> in the eqn y=Asin(ax+bt),if x and y are in meter,t is in second,hen unit of 'a' is 1 /meter true or false? ...

*Image* ...

1. A coil with inductance L=0.70H and active resistance r=20Ω is connected in series with an inductance-free resistance R. An alternating voltage with effective value V=220V and frequency ω=314 rad/s is applied across the t ...