Recent questions tagged class11

If $\omega$ is the cube root of unity then the value of $\large\frac{a\omega+b+c\omega^2}{a\omega^2+b\omega+c}+\frac{a\omega^2+b+c\omega}{a+b\omega+c\omega^2}=?$

asked Jul 12, 2013 by rvidyagovindarajan_1

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A circket ball of mass 150 g is moving with a velocity of 12 m/s and is hit by a bat so that the ball is turned back with a velocity of $20 m/s$ .Force on the ball acts for 0.01s, the average force exerted by the bat on the ball

asked Jul 12, 2013 by meena.p

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A cyclist moves in circular path of radius $100 m$ If the coefficient of friction is 0.2, then the maximum velocity with which the cyclist must take the turn with leaning inwards

asked Jul 12, 2013 by meena.p

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A mass M kg is suspended by a weightless string. The horizontal force that is required to displace it untill the string makes an angle $45^{\circ}$ with initial vertical direction is

asked Jul 12, 2013 by meena.p

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A self propelled car (point mass) runs on a track with constant speed V It passes through three positions A,B, and C on the circular part of track. Suppose $N_A\;N_B$ and $N_C$ are normal force exerted by the track on the car. When passing through A,B, and C respectively then

asked Jul 12, 2013 by meena.p

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A body of mass M is acted upon by a force F and acceleration produced is 'a' . If three equal forces each equal to F and inclined to each other at $120 ^{\circ}$ act on the same body , the acceleration produced will be

asked Jul 12, 2013 by meena.p

1 answer

A block of mass 1 kg lies on a horizontal surface in a truck the coefficient of static friction between the block and the surface is 0.6. If the acceleration of the truck is $5m/s^2$, the frictional force acting on the block is

asked Jul 12, 2013 by meena.p

1 answer

A small disc is on top of a hemisphere of radius R. What is the smallest horizontal velocity v that should be given to the disc for it to leave the hemisphere and not slide down ? (assume there is no friction)

asked Jul 12, 2013 by meena.p

1 answer

Objects A and B each of mass m are connected by light inextensible cord. They are constrained to move on a frictionless ring in a vertical plane. The object is released from rest at the positions as shown. The tension T in the cord just after release will be

asked Jul 12, 2013 by meena.p

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A uniform thick string of length 5 m is resting on horizontal frictionless surface. If it is pulled by a horizontal force of 5N from one end, the tension in the string at 1 m from the force applied is

asked Jul 12, 2013 by meena.p

1 answer

In the figure shown acceleration of A is $a_A=15 \hat i+15 \hat j$ then the acceleration of B is

asked Jul 12, 2013 by meena.p

2 answers

Three equal masses of mass m each are hanging on a string passing over a fixed palley as shown. What is the tension in the string connecting weight B and C

asked Jul 12, 2013 by meena.p

1 answer

Ten one rupee coins are put on top of each other on a table. Each coin has mass 'm' kg. What is the reaction of 6th coin counted from bottom on the 7th coin counted from bottom

asked Jul 11, 2013 by meena.p

1 answer

An insect crawls up a hemispherical surface very slowly. The coefficient of friction between insect and surface is $\large\frac{1}{3}$. If the line joining the center of hemispherical surface to the insect makes an angle $\alpha$ with the vertical the maximum possible angle of $\alpha$ is

asked Jul 11, 2013 by meena.p

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Starting from rest a body slides down a $45^{\circ}$ inclined plane in twice the time it takes to slide down the same distance in the absence of friction. The coefficient of friction between body and plane is

asked Jul 11, 2013 by meena.p

1 answer

The graph shows the displacement of a particle going along x-axis as a function of time. The force acting on the particle is zero in the region

asked Jul 11, 2013 by meena.p

1 answer

Find the value of $\sqrt i.$

asked Jul 11, 2013 by rvidyagovindarajan_1

1 answer

A machine gun of mass 10 kg fires 30 gm bullet at the rate of 6 bullets per second with a speed of $400 ms^{-1}$ .The force required to hold the gun is

asked Jul 11, 2013 by meena.p

1 answer

If $x+iy=\large\frac{a+ib}{a-ib}$, then the value of $x^2+y^2=$?

asked Jul 11, 2013 by rvidyagovindarajan_1

1 answer

The least positive integer $n$ so that $\large(\frac{1+i}{1-i})^n$$=1$ is?

asked Jul 11, 2013 by rvidyagovindarajan_1

1 answer

A balloon of mass 30 kg is falling down with an acceleration of $1.8m/s^{-2}$.Then some mass is removed from the balloon.As a result the balloon moves upwards with an acceleration of $2.2 ms^{-2}$. The mass removed from the balloon is

asked Jul 11, 2013 by meena.p

1 answer

A car of mass m is driven with an acceleration 'a' along a straight level road. against a constant external resistive force R. The velocity of the car is V, the rate at which the engine of the car is doing work is

asked Jul 11, 2013 by meena.p

1 answer

Suppose that a shoelace passes without friction through 5 holes on each side of your shoe. If the tension in that shoe lace is 10 N, how much total force is the shoelace exerting on the right side of your shoe?

asked Jul 11, 2013 by meena.p

1 answer

A particle has initial velocity $\bar v =3 \hat i+4 \hat j$ and a constant force $F=4 \hat i-3 \hat j$ acts on the particle. The path of the particle is

asked Jul 11, 2013 by meena.p

1 answer

A nozzle is discharging water at a rate of 200 litre per second with a speed of 10 m per second. If the water strikes a wall at right angles and does not bounce of the wall, find the force F newton exerted by the wall on water. mass of 1 litre of the water is 1kg

asked Jul 11, 2013 by meena.p

1 answer

A man of mass 60 kg is pulling a mass M by an inextensible string passing over a frictionless (massless) pulley. The coefficient of friction between man and the ground is $\mu=\large\frac{1}{2}$. The maximum value of M that can be pulled by the man without slipping on ground is

asked Jul 11, 2013 by meena.p

1 answer

If you want to pile up sand onto a circular area of radius R, the greatest height of the pile to be erected without spilling sand on to the surrounding area is ($\mu$ - coefficient of friction between sand particles)

asked Jul 11, 2013 by meena.p

1 answer

A block of mass $m=2 kg$ is resting on a rough inclined plane of inclination $30 ^{\circ}$ as shown. the coefficient of friction between the block and the plane $\mu=0.5$ . What minimum force F should be applied perpendicular to the plane on the block so that the block does not slip on the plane $(g=10 m/s^2)$

asked Jul 11, 2013 by meena.p

1 answer

A block is placed on a rough inclined plane of inclination $\theta=30 ^{\circ}$ . If the force to drag it along the plane is to be smaller than to lift it, the coefficient of friction $\mu$ should be less than

asked Jul 11, 2013 by meena.p

1 answer

A block is placed on a rough horizontal plane attached with an elastic spring as shown.

asked Jul 11, 2013 by meena.p

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The coefficient of friction between the block A of mass m and block B of mass 2 m is $\mu$. There is no friction between block B and the inclined plane. If the system of blocks A and B is released from rest and there is no slipping between A and B then

asked Jul 10, 2013 by meena.p

1 answer

A system consists of three blocks A,B and C arranged as shown. The system is pushed by a force as shown in figure. All surfaces are smooth except between B and C,where coefficient of friction is $\mu$. Minimum value of F to prevent block B from slipping downward is

asked Jul 10, 2013 by meena.p

1 answer

A homogeneous chain of length L lies on a table. The coefficient of friction between chain and table is $\mu$. The maximum length which can hang over the table in equilibrium is ( The vertical portion of table is smooth)

asked Jul 10, 2013 by meena.p

1 answer

A car is going at a speed of 6m/s when it encouters a 15 m slope of angle $30 ^{\circ}$. The frictional coefficient between road and tyre is 0.5. The driver applies the brakes. The minimum speed of car with which he can reach the bottom is $(g=10 m/s^2)$

asked Jul 10, 2013 by meena.p

1 answer

Two blocks of 100 kg and 50 kg connected by a massless string passing over a frictionless pulley rests on frictionless inclined plates inclined at angles $30^{\circ}$ and $60^{\circ}$ what is the acceleration and which way the system moves? $(g=10 m/s)$

asked Jul 10, 2013 by meena.p

1 answer

In the figure $A=10 kg,B=5 kg$ and coefficient of friction between A and table is $ \mu=0.2$ . find the minimum value of mass C which may stop A from slipping

asked Jul 10, 2013 by meena.p

1 answer

A box is gently dropped on a conveyor belt in an airport moving of 3m/s. If the coeffiecient of friction between belt and box is 0.5, how far will the box move on the belt (relative to belt) before coming to rest ?

asked Jul 10, 2013 by meena.p

1 answer

Two masses $M_1$ and $M_2$ are attached to end of a string which passes over a pulley attached to the top of a double inclined plane. If $M_1$ and $M_2$ are $5 kg$ each. and the base angles are $30^{\circ}$ each. The tension in the string.

asked Jul 10, 2013 by meena.p

1 answer

A smooth block is released at rest on $45 ^{\circ}$ incline and then slides a distance 'd'. The time taken to slide is 'x' times as much to slide on rough incline than on smooth incline.The coefficient of friction is

asked Jul 10, 2013 by meena.p

1 answer

A block of mass m is in contact with the cart C as shown. The coefficient of static friction between the block and cart is $\mu$. The acceleration $\alpha$ of the cart that will prevent the block from falling satisfies

asked Jul 9, 2013 by meena.p

1 answer

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and wall is $\mu$ The weight of the block is

asked Jul 9, 2013 by meena.p

1 answer

Two beads A and B move along a semicircular wire frame as shown. The beads are connected by an inelastic string which always remains tight. At an instant the speed of A is $u$ . $ \angle BAC=45^{\circ}$ and angle $BOC=75 ^{\circ}$ where O is center of the semicircular arc. The speed of bead B at that instant is

asked Jul 9, 2013 by meena.p

1 answer

With what acceleration 'a' should the box in the figure descend so that a body of mass M placed in it exerts a force $Mg/4$ on the base

asked Jul 9, 2013 by meena.p

1 answer

In the arrangement shown by what acceleration the boy must go up so that 100 kg block remains stationary on the wedge. The wedge is fixed and friction is absent, every where $(g=10 m/s^2)$

asked Jul 9, 2013 by meena.p

1 answer

If $(a_1+ib_1)(a_2+ib_2)......................(a_n+ib_n)=c+id$ then what is the value of $tan^{-1}\large\frac{b_1}{a_1}$+$tan^{-1}\large\frac{b_2}{a_2}$+............................$tan^{-1}\large\frac{b_n}{a_n}$?

asked Jul 9, 2013 by rvidyagovindarajan_1

1 answer

Inside a horizontally moving box, a man finds that when an object is placed on a horizontal smooth table and released; it moves with an acceleration $10 m/s^2$ In this box if 1 kg body is suspended with a light string, the tension in the string in equilibrium position $(g=10 m/s^2)$

asked Jul 9, 2013 by meena.p

1 answer

A boy sitting on top berth in the compartment of a train which just going to stop in a railway station dops an apple aiming at open hand of his brother sitting vertically below his hands at a distance of 2m. The apple will fall

asked Jul 9, 2013 by meena.p

1 answer

A person sitting in an open car moving at constant velocity throws a ball vertically up into air. The ball falls

asked Jul 9, 2013 by meena.p

2 answers

A ball is moving with velocity v strikes a wall moving towards the ball with velociy u. An elastic impact lasts for t seconds. Find the mean elastic force acting on the ball

asked Jul 9, 2013 by meena.p

1 answer

A body of mass 2 kg is moving along x-direction with velocity 2m/s. If a force of 4N is acting on it along y direction for 1 second, then what will be the final velocity

asked Jul 8, 2013 by meena.p

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