Two particles a and b initially at rest

Asked by admin @ 25/08/2021 in Physics viewed by 337 People

Two particles A and B initially at rest, move towards each other mutual force of attraction. At the instant when teh speed of A is V and speed of B is 2V, the speed of centre of mass is

Answered by admin @ 25/08/2021

Initially both A and B were at rest. So momentum of centre of mass is 0. And it is given that there is no external force. Hence no change in momentum of centre of mass. And it will remain 0. As momentum(product of mass and velocity) is zero ans mass is not zero, velocity must be 0.

A particle initially at rest moves along x axis

Asked by admin @ 20/08/2021 in Science viewed by 333 persons

A particle initially at rest moves along the x-axis. Its acceleration varies with time as a = 4t. If it starts fromthe origin, the distance covered by it in …

A particle of mass 2kg is initially at rest

Asked by admin @ 13/08/2021 in Physics viewed by 345 persons

A particle of mass 2 kg is initially at rest. A fore acts on it whose magnitude changes with time. The force - time graph is shown below. The velocity …

A particle of mass m at rest decays

Asked by admin @ 31/08/2021 in Physics viewed by 419 persons

A particle of mass M at rest decays into two particles of m1 and m2 having non-zero velocities. The ratio of the de Broglie wavelength of the particles is a. …

The initial velocity of a particle is u

Asked by admin @ 26/08/2021 in Physics viewed by 273 persons

The initial velocity of a particle is given by u (at t=0) and the acceleration by f , where f=at(where t is time and a is constant). Which of the …

Two particles are oscillating along two close parallel

Asked by admin @ 26/08/2021 in Physics viewed by 297 persons

Two particles are oscillating along two close parallel straight lines side by side. With the same frequency and amplitude . They pass each other moving in opposite directions when their …

Two particles 1 and 2 are allowed to descend

Asked by admin @ 17/08/2021 in Physics viewed by 320 persons

Two particles 1 and 2 are allowed to descend on two frictionless chords OP and OQ. The ratio of the speeds of the particles 1 and 2 respectivelywhen they …

A particle starts moving from rest under uniform acceleration

Asked by admin @ 17/08/2021 in Physics viewed by 362 persons

a particle starts moving from rest under uniform acceleration.It travels a distance x in first two seconds and a distance y in next two seconds.If y=nx ,then n=

Two forces acting on a particle in opposite directions

Asked by admin @ 17/08/2021 in Physics viewed by 330 persons

Two forces acting on a particle in opposite directions have the resultant of 10N. If they act at right angles to each other, the resultant it 50N. Fing the 2 …

A particle starting from rest moves with constant acceleration

Asked by admin @ 17/08/2021 in Physics viewed by 442 persons

A particle starting from rest moves with constant acceleration. If it takes 5.0 s to reach the speed 18 km/h find (a) the average velocity during this period , and …

Two particles are moving with velocities v1 and v2

Asked by admin @ 16/08/2021 in Physics viewed by 291 persons

two particles are moving with velocities V1 and V2 . their relative velocity is the maximum,when the angle between their between is

A particle starts from rest with uniform acceleration a

Asked by admin @ 16/08/2021 in Physics viewed by 283 persons

a particle starts from rest with uniform acceleration a.its velocity after n seconds is v.the displacement of the body in last two seconds is:

A heavy nucleus at rest breaks into two fragments

Asked by admin @ 13/08/2021 in Physics viewed by 306 persons

A heavy nucleus at rest breaks into two fragments which fly off with velocity in the ratio 27:1

A particle rests on the top of a hemisphere

Asked by admin @ 13/08/2021 in Physics viewed by 290 persons

A particle rests on the top of the hemisphere of radius R. The small horizontal velocity that must be imparted to the particle if it is to leave the hemisphere …

A particle starts moving from rest with uniform acceleration

Asked by admin @ 11/08/2021 in Physics viewed by 295 persons

A particle starts moving from rest and uniform acceleration travels distance x in the first 2 seconds and a distance y in the next two seconds if y = mx …