# Recently Active Mechanics Questions

• Q-1>sin2@=4xy/(x+y)2 â‰¤1 is true if & only if (a) x+y=1 (b) x=y,xâ‰ 0,yâ‰ 0 (c)x=y (d)xâ‰ 0,yâ‰ 0 Q-2>if p=2sin@/(1+cos@+sin@) & q=cos@/(1+sin @) then; a> pq=1 b> q/p=1 c> q-p&# ...
replied2009-01-12 04:27:05
• What is the moment of inertia of a solid cone about an axis passing through the centre of the base circle of radius r? ...
replied2009-01-12 04:22:12
• 1 kg ice at 0Â° C is mixed with 1 kg water at 10Â°C,then calculate final temperature. ...
replied2009-01-11 18:09:53
• well i have trouble in understanding the concepts of waves. Selected topics are 1. when a equation can represent a wave equation 2. interference 3. reflection, refraction so if u guys get any concept about these topics then p ...
replied2009-01-11 09:46:17
• The given hing construction consists of two rhombus with the ratio 3:2.The vertex q moves in the horizontal direction with a velocity of v.The velocity of p is _______________ *Image* ...
replied2009-01-11 00:17:59
• *Image* ...
replied2009-01-10 22:02:46
• A body of superdense material with mass twice the mass of earth butsize very small compared oto the size of earth starts from rest from h<<R above the earth's surface. It reaches earth in time ...
replied2009-01-10 07:50:52
• Q1)Two particles 'm1' and 'm2' are connected by a light elastic string of natural length 'lo' and are placed on a smooth horizontal table with separation between m1 and m2 as lo. m2 is projected with a ...
replied2009-01-10 01:27:35
• *Image* at time t=0, string at point P is cut .. at that moment, the end T has velocity V0 , then find velocity of the points P,R,S and K. ...
replied2009-01-10 01:13:40
• *Image* ...
replied2009-01-09 13:46:58
• A uniform disc of mass m and radius r is rolling on a circle by virtue of torque Ï„ given to rod(mass M length L) pivoted to disc.Find angular accelrations of rod and disc. *Image* ...
replied2009-01-09 11:01:16
• On heating a liquid of coefficient of cubical expansion Î³ in a container having coeff of linear exp Î³/3 ,then what will happen to level of liquid in container? ...
replied2009-01-09 03:28:03
• *Image* two cylinders having radii R1andR2respectivelyand rotational inertias I1and I2respectiveely are supported by axes perpendicular to the plane.The large cylinder is initilally rotating with angular velocity Ï‰0The small ...
replied2009-01-09 03:24:28
• Two unequal masses of 1 kg and 2 kg are connected by a string going over a clamped light smooth pulley. The system is released from rest. The larger mass is syopped for a moment 1 sec after the system is set in motion. Find t ...
replied2009-01-08 07:47:00
• A barometer having metallic scale reads height HÎ¸ at temp Î¸Â°C.If the scale is callibrated at temp 0Â°C and Î± is coeff of linear exp and Î³ is coeff of cubical exp. then calculate value of correct height. ...
replied2009-01-08 05:18:06
• from a circular disc of radius R & mass 9m a small disc of radius R/3 is removed whose centre is at 2R/3 . find the moment of inertia of remainning disc about an axis perpendicular to the plane of disc & passing through centr ...
replied2009-01-08 04:39:38
• a body of moment of inertia I is rotated with angular velocity Ï‰ & then its kept on rough horizontal surface. find the expression for time in which it starts rolling. ...
replied2009-01-08 00:18:28
• If length of cylinder on heating inc. 2%,then are of base will increase ___% ...
replied2009-01-07 15:52:39
• A solid ball made of coefff of volume expansion 8 *10-6 /Â°C is immersed in a liquid having coeff of vol expansion 3 * 10-6 /Â°C.Calculate % increase in upthrust when temp increased by 100 Â°C ...
replied2009-01-07 15:42:05
• 20g of boiling water is pooured into a cold brass vessel(specific heat =0.1 cal/g C) of mass 100g.Calculate final temp....... ...
replied2009-01-07 15:15:05
• A 10kg iron bar(specific heat 0.11cal/gÂ°C) at 80Â°C is placed on ice block.How much ice melts? ...
replied2009-01-07 14:52:36
• A block of ice is floating in water with a piece of iron trapped in it. What will happen to the water level as the ice melts? ...
replied2009-01-07 09:45:26
• Q: A hydrogen gas filled balloon, attached with a certain weight, floats inside a water tank such that its top is just inside the surface of water. What will happen to it if it is submerged a certain distance below the surfac ...
replied2009-01-07 02:19:52
• two particles of mass m and 2m are connected by rigid rod(massâ‰ˆ0) and slide with Î¼=0 on circular path. of radius r inside of vertical circular ring.If system released at rest at Î¸=0Â°. Determine 1)velocity v of pa ...
replied2009-01-06 10:18:17
• Q1. prove that when ice will melt, the water level will not increase. Q2. Which one is heavier in air - 1kg cotton or 1kg iron? Q3. A boat with scrap iron in it is floatng in a lake. If the iron is thrown in the lake, wha ...
replied2009-01-05 22:00:12
• in the two cases shown if we are asked energy of the first one we would answer 1/2mv2 for the other case we would answer 1/2I(v2/R2) where I is moment of inertia about O and v is velocity . A is any point on the sphere in fir ...
replied2009-01-05 10:18:11
• A chain of length l is placed on a smooth spherical surface of radius R. with one of its ends fixed at the top of the sphere.What will be the acceleration Ï‰ of each element of the chain when its upper end is released?It ...
replied2009-01-05 10:05:48
• Q: A hydrogen gas filled balloon, attached with a certain weight, floats inside a water tank such that its top is just inside the surface of water. What will happen to it if it is submerged a certain distance below the surfac ...
replied2009-01-05 08:32:50
• GIVEN STATEMENT: Mercury has a tendency to get depressed in the glass tube. The atmospheric pressure would try to raise it from the depressed level. HOW?? AND WHY?? ...
replied2009-01-05 08:29:33
• What is beat frequency plz explain with example ...
replied2009-01-04 20:17:31