
A rod OA of mass m and length L hinged at end O can rotate smoothly in vertical plane about horzontal axis passing through O .It is released from a horizontal position as shown. and strikes a block of mass M kept vertically b ...

Problem: When a photon is emitted from an atom, the atom recoils. The kinetic energy of recoil and the energy of the photon come from the difference in energies between the states involved in the transistion. Suppose, a hydro ...

1. Rolling Question : A sphere S rolls without slipping mving with a constant speed on a plank P.The friction between the upper surface of P and the sphere is sufficient to prevent slipping , while the lower surface of P is s ...

*Image* A mass of 1 kg is suspended by a string A . ANother string C is connected to its lower end[ See fig). if a sudden jerk is given to C , then a) the portion AB of the string will break b)the portion BC of the string wil ...

A cube of mass 2kg is held stationary against a rough wall by a force F=40N pass through centre C.Find perpendicular distance of normal reaction between wall and cube from point C.Side of the cube is 20cm. *Image* ...

A rod OA of mass 4 kg is held in horizontal position by a massless string AB as shown in the figure,Length of the rod is 2 m .Find : a.tension in the string b.net force exerted gy the hingre on the rod *Image* ...

*Image* a system consists of two cubes of masses m1 & m2 respectively connected by a spring of force constant k . find the force (F) that should be applied to the upper cube for which the lower one justs lift after the force ...

a ray of light is incident on concave mirror . it is parallel to principal axis and its height from principal axis is equal to focal length of mirror. the ratio of distance of point B to distance of the focus from centre of c ...

Q In the potentiometer circuit shown,the balance point is at X.State with reason where the balance point be shifted when: 1)resistance R is increased keeping all other parameters unchanged 2)resistance S is increased keeping ...

i still can't figure out the following questions . Please help... 1.A long capillary tube of mass Î gram, radius 2mm and negligible thickness is partially immersed in a liq of surface tension 0.1N/m, The angle of contact =0 a ...

Three identical balls are connected by light inextensible strings with each other as shown and rest over a smooth horizontal table. At the moment t=0, ball B is imparted a velocity. Calculate the velocity of A when it collide ...

A thin convex lens whose focal length in air is known to be 30cm is cut into two parts by a transverse plane parallel to principal axis and 0.5cm above the principal axis. They are placed on the xaxis a shown in the figure.A ...

Q. A hammer of mass M falls from a height h repeatedly to drive a pile of mass m into the ground. The hammer makes the pile penetrate in the ground to a distance d in single blow. Opposition to penetration is given by? ...

Light of wavelength 4000 Ao is incident at small angle on a prism of apex angle 4o The prism has nv = 1.5 & nr = 1.48. The angle of dispersion produced by the prism in this light is ? A)0.2o B) 0.08o C)0.192o D)None of these ...

A lift performs the first part of its ascent with uniform acceleration a and the remaining with uniform retardation 2a.If t is the time of ascent,find the depth of the shaft. (a) at2/4 (b) at2/3 (c) at2/2 (d) at2/8 (According ...

Q: A ball hits the floor and rebounds after an inelastic collision. In this case, a) the momentum of the ball just after collision is the same as that before collision. b) the mechanical energy of the ball remains same during ...

*Image* A finite ladder is constructed by connectiong several sections of 2uF and 4uF capacitors combination as shown. IT is terminated y a Capacitor of C...wht should be the value oif C...so that the equivalent capacitence o ...

a block of mass m produces an extension of 9cm in an elastic spring of length 60cm when it is hung by it, and the system is in equilibrium. the spring is cut in two parts of 40cm and 20cm lengths, the same block hangs in equi ...

Q1. Two ships A and B originally at a distance d = 3 km from each other depart at the same time from a straight coastline. Ship A moves along a straight line perpendicular to the shore while ship B constantly heads for ship A ...

Three sound waves of equal amplitudes have frequencies (v 1), v, (v + 1). They superpose to give beats. What is the number of beats produced per second?? Please give detailed explanation. ...

A particle moves from position {{ar{r}}_{1}}=3hat{i}+2hat{j}6hat{k} to position {{ar{r}}_{2}}=14hat{i}+13hat{j}+9hat{k} under the action of force 4hat{i}+hat{j}+3hat{k},N . The work done will be ...

The fig. shows a silvered lens . ref. index of a = 1.6 and ref. index of b= 1.2 , R1 = 80 cm , R2 = 40 cm and R3 = 20 cm. An object is placed at a distance of 12 cm frm this lens. Find the image posn. http://img835.imageshack ...

A student says that he had applied a force F=k x on a particle and the particle moved in simple harmonic motion.He refuses to tell whether k is contant or not.Assume that he has worked only with positive x and no other force ...

A spherical body of area A and emissivity 0.6 is kept inside a perfectly black body. total heat radiated by the body at temperature T is ... ...

A heavy, flexible, inelastic chain of length L is placed almost symmetrically onto a light pulley which can rotate about a fixed axle, as shown in the figure. *Image* What will the speed of the chain be when it leaves the pul ...

A time varying force F=2t is applied on a spool.The angular momentum of spool at time t about bottommost pt. is?????????? *Image* ...

an electric bulb rated 50W at 100V is used in a circuit having a 200V supply. What resistance R must be put in series with the bulb so that then bulb delivers 500W? ...

A mark placed on the surface of a glass sphere is viewed through a glass prism form an oppositely directed position. If the diameter of the glass sphere is 20 cm, find the position of image if refractive index of glass is 1.5 ...

Traditionally been weak in this part of mechanics...pulley problems samajh aate they magar usse zyaada nahi. Q. A hinged construction consists of three rhombuses with the ratio of sides 3:2:1 . Vertex A3 moves in the horizont ...

A cylindrical vessel of radius r containing a liquid spins continuously with angular velocity Ï‰. Find the pressure at the radialk diatance r from the axis. Take P1 as atmospheric pressure..... ...