Recently Active Mechanics Questions

A drop of water sticks to a glass surface due to cohesive forces between glass and water molecules. But why does an air bubble stick to a glass surface under water? ...

this is an extension of a traditional problem.... here is the setup with some initial compression in the spring such that when string is burned lower block just leaves the ground. (a string is tied b/w two blocks) Here u have ...

An ornament for the courtyard at the world's fair is made up of four spheres each being identical and weighing 2 6 N. The spheres are arranged such that the three of them forms the base and the fourth one lying on their t ...

The lower end of the capillary tube is immersed in mercury. The level of mercury in the tube is found to be 2 cm below the outer level. iF the same tube is immersed in water then the water rise in the capillary is? ...

Water level in tub is 1m.If a capillary tube of very small radius and length 4m is dipped into the water,it rises in the tube up to 2m.If another capillary tube of same radius but 2m length is dipped into water, will the wate ...

In case of beats,intensity of sound at some positions in space remains maximum and at others remains minimum Give appropriate reason also ...

Why closed pipe can't be used as musical instrument ? ...

Q.Two uniform rods A and B of lenghts 5m and 3m are placed end to end.If their linear densities are 3kg/m and 2kg/m , the position of their center of mass from their interface is 1.19/14 m on the side of heavier rod 2.8/7 m o ...

*Image* 1) In the above figure A has a mass 40kg and B is of 15 kg and F is 500N parallel to the smooth inclined plane. The system is moving together.(a) Show that the acc of the system is 45/11 m/s2 (b) Show that the least c ...

*Image* Ques1) Two blocks of masses M1 and M2 (In the above figure) are placed in contact with each other as shown. The voefficient of friction b/w M1 and platform is 2 \mu and that b/w block M2 and platform is \mu . The plat ...

A tube of insufficient length is immersed in water (ST=0.07 N/m) with 1 cm of it projecting vertically upards outside water.What is the radius of meniscus???Radius of tube = 1mm ...

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*Image* A block M with smooth fixed pulleys B and D is on a smooth horizontal surface. A block m is placed on the smooth inclined face of M is connected to one end of an extensible string passing over the pulleysB and D and t ...

A CAR IS TRAVELING WITH A LINEAR VELOCITY v ON A CIRCULAR ROAD OF RADIUS R IF IT IS INCREASING ITS SPEED AT THE RATE OF 'a' MS^-2 THEN THE RESULTANT ACCELERATION WILL BE wHAT AND HOW ?? ...

*Image* pls explain hw cn we find magnitude and direction of acc. ...

Ques) A block is projected up aplne at 30° to the horizontal. It returns to it's starting point with 1/3 rd of it's initial velocity. Calculate the coefficient of kinetic friction b/w the block and the plane. ...

A 1 kg block of wood sits on the top of an identical block of wood, ehich sits on the top of a flat level table made of plastic. The coefficient of static friction b/w the wooden surfaces is @1, and the coefficient of static ...

a rope passes over a fixed pulley such that it makes an angle (A) at its centre. if (u) be the coefficient of static friction between the rope and the pulley, determine the relation existing between the values T1 and T2of the ...

i am starting this thread to start a discussion on rotational motion as i have done in "optical isomerism" in organic section !!! i start with a brief summary....everyone is welcome to put forward his/her coherent views on th ...

A simple pendulum of length "l" carries a bob of mass m.If the breaking strength of the string is 2mg , the maximum angular amplitude from the vertical can be ___θ I tried and tried but without success.Please help me.( Kindl ...

A particle moves in a horizontal circle with vel. v at the end of an inextensible string.If it collides elastically with a straight wall when the string makes an angle 'x' greater than pi/4 with the wall, then its velocity wh ...

A block is placed on an inclined plane of angle 37 .What must be the frictional force b/w block and incline if block is not to slide along incline when incline is accelerating to the right at 3 m/s2. ...

A uniform rod is made to lean between rough vertical wall and the ground.Find the least angle at which rod can lean without slipping.coefficient of friction between rod and wall is 1/2 and rod and ground is 1/4 ...

Ques1) A clothesline hangs between two poles. No matter how tightly the line is stretched, it always sags a little at the center. Explain why. Ques2) A block rests on an inclined plane with enough friction to prevent it from ...

The masses and radii of earth and moon are M1, R1 and M2, R2 respectively, their centres are r distance apart, find minimum speed with which particle of mass m should be projected from a mid way between 2 centres so as to esc ...

*Image* Ques1)A mass M1 lies on a fixed smooth cylinder (Above figure). An Ideal string attatched to M1 passes over the cylinder to mass M2. Show that the system is in equliibrium if Sin A = (M2/M1) Ques2) A body of mass m is ...

*Image* a projectile is fired with intial velocity of 240m/s at a target B located 600m above the point A and at horizontal distance of 3600m , negelecting air resistance , find the value of angle(theta) at which it is projec ...

*Image* In the figure mass m1=i kg and m2 = 4 kg. Find the mass M of the hanging block which will prevent the smaller block from slipping over the triangular block. All the surfaces are frictionless and the strings and the pu ...

A wedge of inclination theta is fixed with a frictionless pulley on its top.A light inextensible rope goes over the pulley.One of its ends is attached to a fixed wall.The other end is attatched to a small block of mass m kept ...

This is not my doubt. This is for others to try out: try both [1] *Image* ...