Recently Active Mechanics Questions

Explain the Process and what should be the correct answer and why? *Image* ...

A balloon starts rising from the earth's surface.The ascension rate is constant and equal to vo.Due to the wind,the balloon gathers the horizontal velocity component vx=ky,where k is a constant and y is the height of ascent.F ...

A+B=C and A+B=C .Find the angle between A and B. Note-A,B,C are vectors and A,B and C are their respective magnitudes. ...

The sum of two vectors A and B is at right angles to their difference.Then (a)A=B (b)A=2B (c)B=2A (d)A and B have the same direction ...

Four forces of magnitude P,2P,3P and 4P act along the four sides of square ABCD in cyclic order.Use the vector method to find the resultant force. ...

Raindrops are falling with a speed of 5 m s -1 at an angle of 37° with the vertical. A man is climbing down a plane of inclination 30° with the horizontal, holding the umbrella vertically up to protect himself. Find the spe ...

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Q. A slightly conical wire of length L and end radii r1 and r2 is stretched by two forces F, F applied parallel to length in opposite directions and normal to end faces. If Y denotes the Young's modulus, then extension produc ...

A 40 kg. mass hanging at the end of rope of length 'l' oscillates in a vertical plane with an angular amplitude 'x'. What is the tension in the rope , when it makes an angle 'y' with the vertical? If the breaking strength of ...

A particle slides from the top down the outside smooth surface of a fixed sphere of radius 'R'. When the particle is at its highest position, what velocity in the horizontal direction should be imparted to it , so that it lea ...

Two bobs of masses 6m and 10m are attached to the two ends of a light inextensible string which passes over a frictionless ring at O. The lighter bob describes a horizontal circle about the heavier bob(which remains stationar ...

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Hi all, get relevant and useful flash animations in physics at http://www.mksfoundation.com/flashlets.aspx and lot of other free stuff for JEE preparation at this site. ...

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*Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This can happ ...

*Image* follow link given post #3 for image please give solutions... ...

*Image* For second, Options B,D are same. And those contain the answer I think For Third, Someone verify. I think it should be C ...

Q.Find the minimum radius of a planet of density rho temperature T which can retain oxygen in it's atmosphere.The mass of oxygen is M and the acceleration due to gravity is g m/s^2. Ans-:sqrt[(9RT)/8*G*m*rho*pie] here i get t ...

The shape of a water clock jar is such that water level. Descends at constant rate at all times.is it falls by x m/s,shape of jar is given by y proportional to x^n find value of n if radius of drain hole is r and can be assum ...

Which of these does not associates with a black body : a) It absorbs radiation b) It emits radiation c) It refracts radiation d) It reflects radiation. I don't remember the question correctly. So Excuse for the language. ...

1. A block A of mass m is placed over a plank B of mass 2m. The friction between them is .5 while the ground surface is smooth. The upper block A is imparted a velocity V towards right. The acceleration of B relative to A wil ...

*Image* *Image* The figure shows mass m moves with velocity u. Ring is restricted to move on smooth fixed horizontal rod. Velocity of the ring at that moment? I thought the answer to be u/2 but the correct answer is 2u. This ...

A point object moves on a circular path such that distance covered by it is given by S=t^2/2 +2t meter(t in seconds) .ratio of magnitude of acceleration at t=2 and t=5s is 1:2 .then radius of circle is? Ans 3√51 Please expl ...

Q. A rod is placed tilted like a ladder is placed having its contact with ground as well as with the perpendicular wall. the rod is making an angle 37° with the horizontal. If the end touching the ground of the rod is being ...

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A uniform rod of length 27 m is rotating through one end through a fixed axis perpendicular to rod.ratio of angular and linear momentum? Options: 3,9,18,27 My answer is 9 but correct one is 18 which comes if we take MV=MWL/2 ...

if a particle covers half of distance with 30m/s. Then what should be the velocity of particle at other half distance,so that its average velocity will be 60m/s. ...

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*Image* specifics ; radius = 5 cm u (coeff) = 0.8 ...

I.184 A chain AB of length l is located in a smooth horizontal tube so that its fraction of length h hangs freeely and toches the surface of the table with End B. At a certain moment the end A of the chain is set free. With w ...