Recently Active Mechanics Questions

A tank is filled with water to a depth of 1m. A hole of cross section 1 cm^2 at the bottom allows the water to drain out. At what distance below the hole the cross sectional area of the stream is 0.9 times the area of the hol ...

A smooth sphere A of radius R and mass M, collides elastically and head on with an identical sphere B at rest. The entire system is on a smooth horizontal ground. Given that the sphere A was rolling without slipping with an a ...

What is the mean pressure exerted by a fluid on the walls of a container of height h? ...

Can any one explain me relative motion? I tried studying it from comprehensive but I could not follow. Please help...... ...

Q Atuning fork of frequency 340 Hz is sounded above a cylindrical tube 1m high. water is slowly poured into the tube . if the speed of sound is 340m/s at what levels of water in the tube will the sound of fork be appreciably ...

1) A student says that he had applied a force F = - k√x on a particle and the particle moved in SHM. He refuses to tell whether k is constant or not. assume that he has worked only with positive x axis and no other forces a ...

1)Can simple harmonic motion take place in a non inertial frame? If yes, should the ratio of the force applied with the displacement be constant? 2)Can a potential energy in a SHM be negative? Will it be so if we choose zero ...

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1.) A chain of mass M and length L is suspended vertically with its lower end touching a scale. The chain is released and falls onto the scale. What is the reading of the scale when a length of the chain has fallen? Neglect t ...

A boy throws a ball at an angle 450 with the horizontal at t = 0 at origin. Path of the ball follows the trajectory y = x – 5x2. The boy start running with a constant velocity 1 m/s along x-axis at t = 0. Take g = 10 m/s2. ...

A ball looses 15% of its KE after it bounces off a concrete slab . What is the speed with which one must throw it vertically down frm a height of 12.4 m to hav it bounce back to the same height?? ...

the bullet is fired from the rifle which recoils after firing. The ratio of the kinetic enegy of the rifle to that of the bullet is : (a) zero (b) one (c) less than one (d) more than one ...

1. A rod of mass m and length l is kept on a smooth wedge of mass M as shown in the figure . If the system is released when the rod is at the top of the wedge , find the speed of the wedge when the rod hits the ground level.{ ...

i got four pts for objects in oblique collision in arihant i dont know how it came.please explain of these three points are written below please explain 1)A pair of equal and opposite impulses act along common normal directio ...

the ratio of acc due to gravity at a depth h below the surface of earth and at a height h above the surface of earth h << radius of earth (A) is constant (b) increases linearly with h (c) increases parabolically with h ...

a uniform thin hemispherical shell is kept staic on an inclined plane of an angle=30 deg if the surface of the inclined plane is sufficiently rough to prevent sliding then the angle @(alpha) made by the plane of hemisphere wi ...

a uniform thin hemispherical shell is kept staic on an inclined plane of an angle=30 deg if the surface of the inclined plane is sufficiently rough to prevent sliding then the angle @(alpha) made by the plane of hemisphere wi ...

Which of the following forces are conservative in nature? a. F = a\hat{i} + b\hat{j} b. F= ax\hat{i} + by\hat{j} \,\,\, (a\ne b) c. F= xy\hat{i} d. F= x{^2}y\hat{i} + 2xy^{2}\hat{j} ...

*Image* The setup shown consists of two identical rods (mass m) hinged together at the ends. This setup is held in the position shown. Now we start applying a constant force F to the free end as shown Find the initial angular ...

A thin rod is held resting on a rough ground with its length inclined at an angle (theta) to the horizontal. The coefficeint of friction between rod and ground is (mu). Show that when the rod is let go it will start slipping ...

1.a long horizontal rod has a bead which can slide along its length, the bead is initially placed at a distance L from one end A of the rod . the rod is set in angular motion in the horizontal plane about the end A with const ...

1.A particle of mass m1 collides elastically with a stationary particles of mass m2 (m1>m2). Find the maximum angle through which the striking particle may deviate as a result of collision. 2. A shell flying with velocity ...

for beginners or class 11 people... easy for ones knowing calculus... a particle is moving with constant speed in the x-y plane... the trajectory is given by the path is y=ax3+bx2+cx+d find the point of time when acceleration ...

1. A uniform chain of mass M and length L is held vertically in such a way that its lower end just touch the horizontal floor.The chain is released from rest in position. Any portion that strikes the floor comes to rest .Assu ...

Q. A boy with a mass of 70kg is standing on a bathroom scale in a lift which is accelerating upwards at 3m/s2. Calculate the resultant force on the boy. Ans: 210 N Shouldn't the resultant force be 910 N? ...

A plank of mass 10 kg rests on a smooth horizontal surface . Two blocks A and B of masses m = 2kg and m = 1 kg resp. lie at a distance of 3 m on the plank as shown in the figure . The friction coeff. b/w the blocks and plank ...

1) Is there any meaning of "Weight of the Earth"? I think it has, but it will be different for different planets and stars since they have different masses, so they'll be attracting earth towards themselves with different mag ...

2 balls are present each of mass m and radius R one is at rest and other moving with a velocity v but the direction of velocity vector does not pass through the centre of the ball at rest... anyways... still the 2 balls under ...

CONCEPT :- For a system to be in equilibrium, the torques acting on it must balance. This is true when we take torques about any point on the system or outside it. DOUBT :- Does the above statement hold when the system is in ...

can ne1 explain me the concept behind this..... plzzzzzzzzzz *Image* ...