Recently Active Mechanics Questions

i dont know where to post this...modern or mechanics section... a good test of ur relativistic skills.. Consider a hypothetical experiment in which an electron gun fires negatively charged particles(electrons) at rate of 10^9 ...

a spool is pulled by a force in vertical direction as shown in figure.what is the direction of friction in this case?the spool does not lose contact with the ground. *Image* [prove mathematically] ...

If all the particles of a system lie in a cube,is it necessary that the CM be in the cube ?? I thinks the ans shud b NO. ...

A SOLID SPHERE OF MASS M AND RADIUS R IS HIT BY A CUE AT A HEIGHT H ABOVE THE CENTRE.FOR WHAT VALUE OF H WILL THE SPHERE ROLL WITHOUT SLIPPING? ...

find the time period of a simple pendulum whose length is comparable to the rarius of th earth.... y is it not 2pi√(l/r)? ...

a cubical block of mass m and edge a slides down a rough inclined plane of inclination @ with a uniform speed.find the torque of normal force acting on the block about its centre. ...

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Can a sail boat be propelled by air blown at the sails by a fan attached to a boat ? Why ? ...

Can a high jumper clear a height even if his CM does not clear the height ?? ...

In a head-on collision between 2 particles,is it necessary that the particles will acquire a common velocity for atleast 1 instance. Can the ans be mathematically derived ?? ...

If the total mechanical energy of a particle is 0,is its LM necessarily 0 ? Is it necessarily nonzero ?? I think is shud b necessarily 0. ...

Point-masses of mass m are at rest at the corners of a regular n-gon, as illustrated in the figure for n = 6. *Image* How does the system move if only gravitation acts between the bodies? How much time elapses before the bodi ...

A small bob of mass m attached to an elastic cord revolves in a horizontal frictionless table with n revolutions per second.If the unstretched length of the cord be "L" and the tension in the cord increases in direct proporti ...

if the fraction of total energy associated with pure rolling is A for a ring and B for a solid sphere....find A & B ...

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q a rod oa rotates about a horizontal axis about o with a constant anticlockwise velocity w=3 radians per second. as it passes the position θ=0 a small block of mas m is placed on it at aradial distance of r=450mm if the blo ...

a chord is used to lower vertically a block of mass M through a distance d at a constant downward accn g/3 d work done by d chord on d block is ? a ballon is going vertically upwards with a velocity of 10m/s 75m above d groun ...

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A cycloid is a curve so that time of descent under action of gravity is minimum for any two pts on the curve find its eq ( be original no copywork Q inspired from a model in a science park i visited ) ...

two block a and b ,each having amass of 320g connected by a light string passing over a smooth light pulley , the horizontal surface on which the block a can slide is smooth . the block a is attached to a string of spring con ...

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a stone is dropped into a well 80m deep & impact of sound is heard after 4.25 s if g=10m/s2 d vel of sound in air is ...

*Image* LAB=LCD=LEF/2=LGH/2 RAB=REF=RCD=RGH/2 Pressure at A is 2p an at D is p .The volume flow rate thru the pipe AB is Q.Volume flow rates through EF and GH are a)Q/17 and Q/5 b)q/17 and 16/17 Q c)Q and Q ...

a stone is dropped into a well 80m deep & impact of sound is heard after 4.25 s if g=10m/s2 d vel of sound in air is ...

a stone is dropped into a well 80m deep & impact of sound is heard after 4.25 s if g=10m/s2 d vel of sound in air is ...

a stone is dropped into a well 80m deep & impact of sound is heard after 4.25 s if g=10m/s2 d vel of sound in air is ...

Q a particle moves on acurved path with constant sped v .the acceleration of particle at x=0 is 2av2 .the path of particle is a)straight line b)parabolic c)eliptical d)none ...