Recently Active Physics Questions

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a point mass m starts from rest and slides down the surface of a frictionlesssolid sphere of radius r as shown in fig.(a)measur angles from the vertical and P.E.from the top(b)change in P.E.of the mass with the angle(c)K.E. a ...

A ball of mass m is dropped on to a floor from a certain height The collision is perfectly elastic and the ball rebounds to the same height and again falls. Find the average force exerted by the ball on the floor during a lon ...

A gun is mounted on a railroad car. The masses of shell gun car is 50m where m is mass of one shell. If the velocity of gun w r t gun in its state before firing is 200m/s What is the recoil speed of the car after the second s ...

During a heavy rain hailstones of average size 1 cm dia falls with a average speed of 20 m/s. Suppose 200 hailstones strike every sq.m of a 10mX10m roof perpendicularly in one sec and assume that the hailstones do not rebound ...

2 circular loops of equal radii are placed coaxially at some separation. The first is cut and a battery is inserted to drive a curent in it . The current changes slightly due to the variation in resistance with temperature. D ...

A metallic disc of radius r can rotate freely inside a long solenoid (ideal), abt a metallic shaft which runs parallel to the axis of the solenoid and is perp to the plane of the disc and passes through its centre.. Total res ...

Q1. Assume that the light is monochromatic. Let the no. of photons falling on a surface per unit time be 'n' and I = intensity of light.. Then I\propto n^x where x= _____ Q2. Change in phase when a longitudinal wave reflects ...

MULTI ANSWER CORRECT *Image* How to do the charge distribution here? ...

*Image* two blocks each of mass M are connected to the ends of a light frame as shown in figure. the frame is rotated about the vertical line of symmetry the length of each side being l.the rod breaks if the tension in it exc ...

Q(1) An inductor is connected to a battery through a switch. Explain why the emf induced in the inductor is much larger when the switch is opened as compared to the emf induced when switch is closed .( not a doubt) Q(2) A met ...

A straight rod of mass m and length l can slide on 2 parallel plastic rails kept in a horizontal plane with a seperatrion d……coefficient of friction between wire and rails is u….if current in wire is i…wat mag filed m ...

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the particle m in the fig is moving in a vertical circle of radius R inside a track.There is no friction.When mis at its lowest position,its speed is vo.(a)what minimum value vmof vofor wich m will go completely around the ci ...

*Image* A setup consistomg of 3 identical balls (points) attached to a small massless ring is rotating on a smooth table. it is known that the ring is at rest at the instant shown in the figure. Just now however one of the st ...

Does wavelength of light depend on temperature? Just asking coz if it would depend then fringe width should also depend on temperature... ??? ...

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A hypothetical mag field existing in a ragion is given by \vec{B}=B_{0}\vec{e_{r}} wer e_{r} denotes unit vector along the radial direction of a point relative to the origin and B0=constant.....A circular loop of raduis a car ...

Assertion :In an atwood machine when the masses r in motion , for a heavy rough pulley tension on both side of pulley r different Reason : Acceleration of both masses r different *Image* ...

hey dude i hv qualified for the 2n stage and hv 1 month to prepare my physics is kkk for maths what to study and how much to study in astronomy and what to study can anyone give me the link of the papers ...

i bought a book an introduction to mechanics by kleppner and i think its a very gud buk both for physics olympaids and iits however it has only mechanics can anyone give me buk on the same level or a basic guide of the contem ...

A particle is projected from ground with speed "u" such that the horizontal range is "R" and the maximum height is "H". The angular velocity of the particle about the point of projection, when it is at the highest point of it ...

can any one explain what is lepton number ??? and give any usefull formulae relating to it ?? guys please help .. and guess what it was on ISAT sample paper 2010 !! ...

Just like mass and charge, each particle has a quantity called “Lepton Number”. The table below gives charge and Lepton number of some particles. Like charge, lepton number should be conserved in any physical process. ((p ...

STATEMENT 1: A cylinder fitted with a movable piston contains a certain amount of liquid in equilibrium with its vapour. The temperature of the system is kept constant. If the volume of the vapour is decreased by moving the p ...

A particle is observed from two frames s1 nd s2. The frame s2 moves wid respect to s1 wid an acceleration a .Let F1 nd F2 be the pseudo forces on the particle when seen from s1 nd s2 resp..which of the following r not possibl ...

*Image* Both A (suspended by a fixed rod) & B are of seme dimensions & same material If both are heated to the same temperature (A) A requires more heat (B) B requires more heat (C) Both require same heat (D) Can't say from t ...

The earth's gravity provides the centripetal force on a orbiting satellite to keep it moving in circle at constant speed . Which statements best explains why the speed of the satellite does not change even though there is a n ...

At a given instant there are 25% undecayed radioactive nuclei in a sample. After 10 seconds the number of undecayed nuclei redu ces to 12.5%. Calculate: (i) mean life of the nuclei (ii) the time in which the number of undecay ...