Recently Active Physics Questions

Why is it that momentum is mv while kinetic energy is 1/2 m v2 and not some other way.. like momentum is 2mv, while KE is mv2 A very very basic and important question which i would like some class IX-X students to answer firs ...

if tan θ=2 is satisfied by α, β then find the value of tan α/2+tanβ/2=1. ...

prove that cos 180°/15. cos 360°/15. cos 540°/15.............to 7 factors=1/2^7 ...

*Image* the two plates of a capacitor with capacitance C is given q1 and q2 charge,,the system is as shown where R is resistance..the key is closed at t=0 find charges on the plates after time t. ...

\; \; A\; \; BODY\; \; SLIDES\; FROM\; \; REST\; \; A\; \; LENGTH\; \; l\; \; DOWN\; \; A\; \; ROUGH\; \; PLANE\; \; OF\; \; INCLINATION\; \; \alpha \; AND\; \; COMES\; TO\; \; \; REST\; \; AFTER\; \; SLIDING\; \; A\; \; DIST ...

A solid sphere of mass m and radius r is placed inside a hollow spherical shell of mass M and radius R as shown in figure .A particle of mass m^' is placed on the line joining the two centres at a distance x from the point of ...

Two bodies of masses 10kg and 20kg are plaeced at a distance 1.0 m apart and released.Assuming that only mutual gravitational forces are acting,find the speeds of the particles when the separation reduces to 0.5 m. ...

What is the Diff between streamline and steady flow....?? In which case can we use the equation A1V1 = A2V2 ?? ...

*Image* ...

A particle of mass m moves on x axis as follows:It starts at t=0 from x=0 and comes to rest at t=1 and x=1.If 'a' denotes the instantaneous accelaration of this particle then, a) a can not remain +ve for all t in the interval ...

draw the approximate time dependence of moduli of an and tangntial at accelration vectors,as well as of the projetion of total acceleration vector av on the velocity vector direction for a projectile fired at angle @ from azi ...

What are the conditions for TIR on second surface of prism.It is said that A>2C.what if A=2C.Pls explain ...

Q.) 3 small balls each of mass 1gm are suspended separately from a common point by silk thread each 1m long. The balls are identically charged and are located at the corners of an equilateral triangle of side length 3cm. What ...

*Image* yeah so my doubt... magnetic field= weber/squared metre thus weber must be the unit of NUMBER of field lines but then since weber signifies number of field lines, it must be dimensionless.. giving field's dimension as ...

1.Positive charge Q is distributed uniformly over a circular ring of radius R.A particle having mass m and a negetive charge q,is placed on its axis at a distance x from the centre.Find the force acting on the particle and it ...

A particle slides at constant speed in a horizontal circular path on the frictionless inner surface of an inverted right circular cone. How is the particle’s kinetic energy related to its potential energy ...

at moment t=0 a particle is set into motion at the velocity v0..whereupon it begins changing as per v= v0[1-t/b] where b=constant.plot vx(t) and displacement x(t) curve! ...

AB is a string whose one end A is fixed at the highest point of a ring placed in vertical plane. C is the center of the ring. At other end B of the ring, is attached a bead of mass m , wich can slide along the ring.If the bea ...

A particle starts from rest with constant acceleration . The ratio of space - average velocity to the time -average velocity is ...

IF THE MINIMUM HORIZONTAL FORCE REQUIRED TO DRAG A HEAVY BODY ON A ROUGH HORIZONTAL SURFACE BE n TIMES ITS MAGNITUDE,WHEN IT BE INCLINED TO THE HORIZONTAL AT THE ANGLE OF FRICTION .FIND THE CO-EFFICIENT OF FRICTION. ...

*Image* Is N= mg(cos α+sinα ) f= mg(cosα-sinα) \alpha \leq \frac{\mu -1}{\mu +1} ...

Plz make me understand the meaning of surface energy. And another thing why spraying results in coldness??? Plz give me explanation. ...

Point charges q and --q are located at the vertices of a square with diagonals 2l as shown . Find the magnitude of the electric field strength at a point located symmetrically with respect to the vertices of the square at a d ...

4. A chain of length l is held stretched out on a frictionless horizontal table, with a length x hanging down through a hole in the table. The chain is re- leased. As a function of time, find the length that hangs down throug ...

*Image* give the hint. ...

*Image* this came in nsep 2007 . ...

*Image* plz give me the solution for this one! ...

A solid body X of heat capciity C cools cc to newtons law of cooling. the atmospheric temp 300k.At time t=0 its temp is 400k it and at time t1its temp is 350K At this time t1the body X is connected to a large body Y at atmosp ...

*Image* ...

When slightly different weights are placed on the two pans of a beam balance,the beam balance comes to rest at an angle with the horizontal.The beam is supported at a single point P by a pivot (A)The net torque about P due to ...