Recently Active Physics Questions

1) Internal forces can change the linear momentum of portion of the system, but they can't change the the total linear momentum of the entire system. WHY? 2)How can the centre of mass of a body be at a point outside the body, ...

(1) A monkey of mass 15kg is climbing on a rope with one end fixed to the ceiling.If it wishes to go up with an acceleration of 1m/s2,how much force should it apply to the rope?If the rope is 5m long and the monkey starts fro ...

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1. In old texts, 4 pi lines of force existed. pi isnt a natural no. exp. 2. can v knw if everthing in the universe became twice as big? 3. the moon rotates earth so that only one hemisphere faces earth.can v ever see the othe ...

Q1: A long, thin, pliable carpet is laid on the floor. One end of the carpet is bent backand then pulled backwards with constant unit velocity, just above the part of the carpet which is still at rest on the floor. *Image* ...

a uniform chain of mass m and length L is suspende so that its lower end just touches a smooth inelastic inclined plane with angle=45 .when it is released find the total impusle on the plane and the the force exerted by the c ...

*Image* A Projectile is fired from the left side as Shown in figure at an angle 'Alpha' so that It just grazes or passes the Four vertices of the given hexagon. Find the ratio of the maximum and minimum Velocities of the Proj ...

A particle is projected vertically upwards from a point A on the ground. It takes time t1 to reach a point B but it still continues to move up. If takes further t2 time to reach the ground from point B. Then find the height o ...

Why is the outer layer of optic fibre has refractive index of 1.48 and inner layer has refractive index of 1.5? Why didn't they have anyy other value of refractive index? How is it applicable to total internal reflection? ...

*Image* find the acceleration of the 1 kg mass!! :D ...

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*Image* the net force acting on the particle shown if figure is: 1. m a (vector) 2. F(vector) 3. F(vector) + m a (vector) 4. F(vector) - m a (vector) ...

It has been almost a week now and ccb is still not showing the indicative seats...a message"your choices have not been processed yet " is being displayed.....is everyone facing a similar problem..??? plzz reply.. ...

1.select the correct alternatives (a)Work done by the friction is always zero. (b)Work down by the kinetic friction can be positive (c)Kinetic energy of the system can not be increased without applying any external force (d)W ...

In electron's frame of reference, attractive electrostatic force is balanced by centrifugal force [don't chuckle to read that word as many including me often do ;)] and thus doesnot move! (remember we are in electron's refere ...

please solve pg 166 Q12). 2 conducting spheres radii R1 and R2 kept separated if spheres connected by conducting wire, find capacitance Ans = 4*pi*epsilon not*(R1+R2) Why is it parallel Q47.b) capcitor 5 microfarad charged to ...

1) In a series resonant LCR circuit the voltage across R is 100V and R= 1KΩ, C=2μF. The resonant frequency ω is 200 rad s-1. At resonance, the voltage across L is: a)40 b)250V c)4*10-3V d)2.5*10-2V 2)A coil of inductance 3 ...

*Image* Five identical capacitor plates each of area A are arranged such that adjacent plates are at a distance d apart. The plates are conneted to a source of emf V as shown.What is the magnitude and nature of charge on plat ...

A step down transformer reduces 220V to 11V. the primary draws 5amp. of current and the secondary supplies 90amp. The efficiency of transformer is: 1) 20% 2)44% 3) 90% 4)100% ...

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a spotlight S rotates in a horizontal plane with a constant angular vel. of o.1 rad/s . The spot of light P moves alsong the wall at a distance of 3 m .What is The vel. of the spot P when angle is 45? *Image* Q2 . on friction ...

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Two children stand on a large, sloping hillside that can be considered as a plane. The ground is just sufficiently icy that a child would fall and slide downhill with a uniform speed as the result of receiving even the slight ...

CAN ANYONE SOLVE THE FOLLOWING: ∫ x/dx SORRY EVERYONE MY MISTAKE I ADDED INTEGERAL IN PHYSICS............... BUT PLEASE SOLVE THIS PROBLEM ...

*Image* FIND VELOCITY OF BLOCK AT THE MOMENT SHOWN IN FIGURE. (speed u1 and u2 are constant. give your ans. with respect to coordinate system shown in figure) ...

Q. In a uniform gravitational field of gravitational acceleration g', two particles move horizontally with initial velocities u1=3m/s and u2=4m/s in a direction opposite to each other. Find the distance of separation and time ...

What is the Rule governing the relation of angle between the direction of magnetic field and magnetic moment? ...

A system consists of a cylindrical anode of radius B and a coaxial cylindrical cathode of radius A . A filament located along the axis of the system carries a heating current I . Find the least potential difference between th ...

torque = dL/dt this expression is valid only if the origin from which it is calculated is an inertial frame . why???? ...

hey guyes please help me out i have lot of conceptual confusions in electrostatics. 1. A charged rod attracts bits of paper due to polarizationin paer molecules but why they often jump violently away from it when touched by t ...