Recently Active Mechanics Questions

Sir I am facing problems in solving the problems of NewtonsLaw especially those of pulleys.Please help. ...

A chain of mass M and length l is suspended vertically with its lowest end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of chain, x, has fallen? (Neglect the ...

A particle is projected at an angle of 60° with speed 10√3 from teh point A as shown in teh fig......at the same time the wedge is made to move with speed 10√3 towards rigth as shon in the fig.....then time after which p ...

Question. A uniform power pole of mass m and lenght L is hoisted into a vrtical position with its lower end supported by a fixed pivot at 0. The wires supporting the wires are accidently released, and the pole falls to the gr ...

A wooden block, with a coin placed on its top, floats in water as shown in figure. The distance l and h are shown there. After some time the coin falls into the water. Then (A) l decreases and h increases (B) l increases and ...

A massive vertical wall is approaching a man at a speed u. When it is at a distance of 10 m, the man throws a ball with speed 10 m/s at an angle of 37° which after completely elastic rebound reaches back directly into his ha ...

Can friction do positive work? If yes explain with an example? If friction can do positive work, then (from work-energy theorem) friction can increase the kinetic energy of an isolated system. Give your views on this statemen ...

please tell me xact defination of hydrostatic paradox? ...

*Image* A disc of mass M and radius R is lying on a smooth horizontal surface.A particle of mass M moving horizontally with a velocity V collides with the disc at B and sticks to it.Speed of point A on the disc just after imp ...

A wire of length l is bent into shape of an n sided regular polygon .If its mass be m , determine its polar M.I. about its centroid. Also find the M.I., in the limiting case as n-->∞ ...

i was browsing the net for a book by david morin and i found this site http://translate.googleusercontent.com/translate_c?hl=en&sl=zh-CN&u=http://phys.5d6d.com/thread-431-1-2.html&prev=/search%3Fq%3Dhttp://phys.5d6d.com/threa ...

a block tied between two identical springs is in equilibrium . if the upper spring is cut, then the acceleration of the block just after the cut is 6 m/s2 .now if instead of the upper string, the lower string is cut then the ...

1)two planets A and B describe circles of radii r1 and r2 round the sun as centre with speed varying as the square root of their radii... Find the angle between the radii of these two planets when their relative angular veloc ...

the masses m1,m2and M are 20,5,50 kg respectively .the coefficient of friction between m1 and M and that of m2amd ground is 0.3.the string and pulleys are maseless.the string is perfectly horizontal between p1 and m1 and also ...

A belt of mass 2 kg is wrapped over two cylindrical wheels of small radii rolling on a horizontal rough surface.Each wheel has a velocity 3 m/s as shown in the figure(assume that belt does not slip).What will be the kinetic o ...

q1) *Image* 5 blocks are placed in the manner shown in the figure. Mass and legth of each such block is m and l. What should be the distance between each of the blocks to preserve equilibrium? (Distances should be equal) ...

Hi Tiitians , here is one googly frm my side ...but its a simple one though we kno that acceleration a = dv/dt = vdv/dx .....(1) now consider a particle with a positive velocity at t=0 and a negative acceleration . Assume thi ...

these days i am seeing a lot of sums being solved by a rather new concept negative mass can anyone expln to me its basic theory and its working and applications and if possible any buk over it ...

*Image* PS: i dont hav d ans ...so pls post full method ....its not a lengthy one :P ...

two balls with masses 1 kg and 2 kg are slipped on a thin smooth horizontal rod. the balls are interconnceted by a light spring of stiffness k=24.the left hand ball is imparted velocity v1=12cm/s. find the oscillation frequen ...

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 ...

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 ...

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/ ...

*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 ...