Recently Active Physics Questions

how to find potential due to half figures(hemisphere, half shell etc) and also electric field , using known results for the full figures?? like in case of hemisphere do we simply reduce mass to m/2?? ...

T1 is the time period of simple pendulum.The point of suspension moves vertically upwards according to y=kt2,where k=1m/s2.New time period is T2,then T21/T22 = A. 4/5 B. 6/5 C. 5/6 D. 1 ...

Q) There is a uniform solid sphere with charge density 'd' and radius 'R'. Now some part of the solid sphere is removed from it. The removed portion is also a sphere of radius 'R/2'. Thus we are left with a solid sphere and a ...

1) In LCR circuit , if (1/LC)<(R^2/4L^2) , the circuit would be : a) oscillatory b) dead beat c) critically damped d) none of these 2) A circuit has an inductance 10 mH, capacitance 0.1 \mu F and resistance 1 K \Omega s. I ...

i was going thru irodov and it struck me most o the problems i cant solve is coz i dont hv a sufficient mathematical base like the famous sum of cats and dog http://targetiit.com/iit-jee-forum/posts/cats-n-dogs-problem-12941. ...

Point A moves uniformly with velocity 'v' so that the vector 'v' is continually "aimed" at point B which in its turn moves rectilinearly and uniformly with velocity u<v. At the initial moment of time v perpendicular to u a ...

*Image* WAT WILL B D SPEED OF D IMG? SPEED OF OBJT IS Vm =3m/s SPEED OF plane MIRROR IS Vo=2m/s ...

*Image* 12 identical rods made of same material are arranged in form of a cube. The temp. of P & Qare maintained at 90 C & 30 C resp. The temp. of V , in steady state is? ...

3 solid hemispheres, each of radius (R) are placed in contact with each other, side by side, such that their flat surfaces rest on the rough horizontal ground . a solid sphere of mass(m) is symmetrically placed on the top of ...

2 point charges +q and -q are fixed at (a,0,0) and (-a,0,0). A third point charge -q is at the origin. State with reason whether equilibrium is stable, unstable or neutral if it's slightly displaced : a) along X-axis b) along ...

a ball is dropped onto a horizontal plane from a height h above the ground. if the co-efficient of restetution is e find the total distance traveled before the ball comes to rest? ...

Question. A block having equilateral triangular cross-section of side a and mass m is placed on a rough inclined surface,so tat it remains in equilibrium . The torque of normal force acting on the block about its center of ma ...

*Image* Question. Two blocks of masses 10 kg & 2 kg are connected by an ideal string passing over a fixed smooth pulley as shown in above figure. A monkey of mass 8kg started climbing the string with a const. acceleration 2m/ ...

A non conducting sheet of larg surface area and thickness d contains uniform distributoin of density ∂. find E at a pt. P inside the plate, at a dist. x from the cetral plane. ...

*Image* Question. A sitting cat in a field suddenly saw a dangerous bull dog at a distance l from her. To save her precious life, the cat runs away in a straight line with const. velocity u. Without any time lag the dog start ...

*Image* Question. A small spherical ball is released from a point at a height h on a rough tck as shown in the figure. Assume that it does not slips anywhere , find its linear speed when it rolls on the horizontal part of the ...

A gas bubble from an explosion under water oscillates with a period T proportional to PadbEc ,where P is the static pressure,d is the density of water and E is the total energy of the explosion.Find values of a,b and c. ...

A student performs an experiment to determine they Young's modulus of a wire,exactly 2m long,by Searle's method.In a particular reading,the student measures the extension in the length of the wire to be 0.8 mm with an uncerta ...

Q. A spherical ball of mass m and radius r rolls without slipping on a rough concave surface of large radius R. It makes small oscillations about the lowest point. Find the time period. Answer:- 2π √ 7(R-r)/5g please show ...

1)A Uniform cylinder of mass m & length L is released from rest , with its lower end touching a frictionless horizontal floor.At the initial moment , the rod is inclined at 300 with the vertical.Find the value of normal react ...

Show that if a rod held at an angle θ to the horizontal & released , its lower end will not slip if the friction coefficient between rod & ground is greater than (3 sinθcosθ )/(1+3sin2θ) ...

A uniformly charged ring of radius 0.1 m with afrequency 104 rps about its axis. The ratio of energy density of electric field to the energy density of magnetic field at a point an the axis at the distance 0.2 m from the cent ...

A co-axial cable is made up of two conductors. The inner conductor is solid and is of radius R1 and the outer conductor is hollow of inner radius R2 and outer radius R3. The space between the conductors is filled with air.The ...

A ray of light is incident at a small angle "i" on a surface of a prism of small angle "A" & emerges normally frm the opposite face. If the refractive index of the prism material is "n", the angle of incidence "i" is nearly e ...

Question., A uniform solid cylinder of radius R=15cm rolls over a horizontal plane passing into an inclined plane forming an angle α=30 deg with the horizontal downwards. Find the max. value of the velocity vo which still pe ...

A diwali cracker known as sudarshan chakra works on the principle of thrust. Consider such a toy the centre of which is hinged. The initial mass of the toy is M0 and radius is R. The toy is in the shape of a spiral the turns ...

A man with some passengers in his boat,starts perpendicular to flow of river 200m wide and flowing with 2m/s.Boat speed in still water is 4m/s.When he reaches half the width of the river the passangers asked him they want to ...

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A ball is projected on smooth inclined plane in direction perpendicular to line of greatest slope with velocity of 8m/s.Find it's speed after 1 sec. *Image* ...

Three particles A, B, C of mass m each are joined to each other by massless rigid rods to from an equlateral traingle of side a. Another particle of mass m hits B with a velocity v0 directed along BC. The colliding particle s ...