Recently Active Physics Questions

Question. Two steel rods & an aluminium rod of equal length l0 and equal cross-section are joined rigidly at their ends as shown in the figure. ______________________________________ |______________________________________| & ...

If the atom Fm257100 follows the Bohr Model & the radius of Fm257100 is n times the Bohr radius , then find n : (A) 100 (B) 200 (C) 4 (D) 1/4 ...

A nucleus with mass number 220 initially at rest emits an α-particle . If the Q value of the reaction is 5.5 MeV , Calculate Kinetic Energy of the α - particle (A) 4.4 MeV (B) 5.4 MeV (C) 5.6 MeV (D) 6.5 MeV ...

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A balloon is ascending vertically with an acc of 0.2m/s2.Two stones are dropped from it at an interval of 2 sec.Find the distance between them 1.5 sec after the second stone is released(g=9.8) ...

Fig shows the v-t graph of particle moving in straight line.Find the time when particle returns to the starting point *Image* ...

Question. Consider a solid sphere of radius r and mass m which has charge q distributed uniformly over its volume.The sphere is rotated about a diameter with an angular speed x . Show that the magnetic moment y and the angula ...

A charged particle x moves towards another charged particle y . For the system of x and y , the total momentum is p and the total energy is E . Then : (a) p and E are conserved if both x and y are free to move (b) p and E are ...

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the bob of a stationary pendulum is given a sharp hit to impart it a horizontal speed of 3gl . find the angle rotated by the string before it becomes slack? ans:cos-1 1/3 ...

while doing a sum the emf of a battery in a circuit came out to be negative.surprisingly the answer was negative.how is it possible.how is the current flowing then?? ...

*Image* A uniform chain of length l and mass m is hanging vertically from its ends A and B which are close together . At a given instant the end B is released. What is the tension at A when B has fallen a distance x [x<l] ...

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1)a uniform circular loop is rotating clockwise in absence of gravity with tangential speed v0.if v be velocity of transverse waves travelling on the strin then v>v0/v<v0/v+v0?(wat is the meaning of the question?) 2) ...

a small heavy block is attached to the lower end of a light rod of length l which can be rotated about its clamped upper end.what minimum horizontal velocity should be given so that it moves in a complete circle? ...

A wire of length 60cm and mass 16gm is suspended by a pair of flexible leads an a magnetic field of induction 0.6 weber/metre2 as shown. What is the magnitude and direction of the current required to remove the tension in the ...

solid cube half immersed in water has time period of small vertical oscillation equal to p/5 s(p means pie).find mass of body.. ...

A small block of mass m is kept on a rough inclined surface of inclination "theta" fixed in an elevator.the elevator slide on the wedge. The work done by friction on the block in time t is: Ans: mgvtsin^2[ theta] reply soon!! ...

*Image* consider the point P at a distance R/2 from centre. When we write angular momentum on the point, the expression is: Iω+mvcm(r/2) so when we substitute ω, do we make it equal to vcm/R or vcm/2R v/2R is considering th ...

A point source S of light is emitting power P.A sphere of radius r is situated at distance R from source S (R>>>r),has mass M ans specific heat capacity C. Find the time in which temperature of sphere rises by θ°C ...

A perfectly elastic ball is thrown from the foot of a plane inclined at an angle θ to the horizon . If after striking the plane at a distance ' l ' from the point of projection it rebounds and retraces its former path , find ...

TWO THIN LIGHT RODS AB(mass M,lenmgth L)AND CD(mass 2M,length 2L)ARE CONNECTED TO MAKE A T AS SHOWN IN FIGURE.THE ASSEMBLY IS KEPT VERTICAL ON A FRICTIONLESS HORIZONTAL SURFACE AND IS RESTRAINED TO FALL SIDEWISE .WHAT IS THE ...

A point charge Q is placed at x=k on the x-axis, k>1. There's a conducting sphere at the origin, of radius 1 unit. Find the field at the origin due to induced charges. ...

Statement 1 : Frictional forces are conservative forces. Statement 2 : Potential energy cannot be associated with fricionless forces. I'm not much sure with my ans........ ...

*Image* the cell is ideal. what is th PD across the capacitor?? pleaxe xplain. ...

*Image* each side has R resi. this sys. will last till infinite series ? ...

Ex=0 and Ey=k y in a 2dimensional plane map the electric field lines. ...

*Image* what is the current flowing in G? PD across 5F capacitor.... PD across 4F capacitor... ...

Is the momentum of a closed system of particles remains constant in an inertial reference frame or not ????? Is the momentum conservation law holds only in inertial frames ?????? Well there is a reason for posting such a simp ...