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Recent questions tagged class11

A ball is dropped from a height of h from ground. If the coefficient of restitution is e, the height to which the ball goes up after it rebounds for the nth time is

asked Jul 17, 2013 by meena.p

2 answers

A spring with a spring force constant $k=800\; N/m$ has a length of 5 cm. The work done in extending from 5 cm to 15 cm is

asked Jul 17, 2013 by meena.p

1 answer

A 50kg man with 20kg load on his head climbs up 20 steps of 0.25m height each. The work done in climbing is

asked Jul 17, 2013 by meena.p

1 answer

There will be an increase in potential energy of the system if work is done upon the system by

asked Jul 17, 2013 by meena.p

1 answer

A block of weight $W$ is pulled along a distance $d$ on a table. The work done by the weight is

asked Jul 17, 2013 by meena.p

1 answer

A block of mass 5 kg is being raised vertically upward by the help of a string attached to it. It rises with an acceleration of $2m/s^2$. The block rises by 2.5 m .the work done by tension and work done against gravity are respectively

asked Jul 17, 2013 by meena.p

1 answer

A force of 0.5 N acts on body of mass 5 kg initially at rest for one minute. Find the work done by the force.

asked Jul 17, 2013 by meena.p

1 answer

Displacement of a body of mass 2 kg varies with time as $s=t^2+2t$.Where s in meters t in seconds. The work done by the force acting an body during the time t=2s to t=4s is

asked Jul 17, 2013 by meena.p

1 answer

A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time 't' is proportional to

asked Jul 16, 2013 by meena.p

1 answer

If $z$ is a complex number so that $iz^2-\overline z=0$, then $|z|= ?$

asked Jul 16, 2013 by rvidyagovindarajan_1

1 answer

If $\large\frac{c+i}{c-i}$$=a+ib$, then $a^2+b^2$ = ?

asked Jul 16, 2013 by rvidyagovindarajan_1

1 answer

The complex number $\large\frac{1+2i}{1-i}$ lies in which quadrant?

asked Jul 16, 2013 by rvidyagovindarajan_1

1 answer

If $z$ is any complex number then $\large\frac{\overline z}{|z|^2}$$= ?$

asked Jul 16, 2013 by rvidyagovindarajan_1

1 answer

The equation $z^2=\overline z$ has how many solutions ?

asked Jul 16, 2013 by rvidyagovindarajan_1

1 answer

Work done by force $F=(-6x^3\hat i)\;N$ in displaying particle from $x=4m$ to $x=-2m$ is

asked Jul 16, 2013 by meena.p

1 answer

Force acting on a particle is $(2i+3j)N$ . Work done by the force is zero, when the particle is moved on the line $3y+kx =5$ value of k is

asked Jul 16, 2013 by meena.p

1 answer

Work done by the conservative force on a system is equal to

asked Jul 16, 2013 by meena.p

1 answer

A body of mass 2 kg is moving on the ground comes to rest after some time. The coefficient of kinetic friction between body and the ground is 0.2. The retardation in the body is

asked Jul 16, 2013 by meena.p

1 answer

The integral solution of the equation $(1-i)^x=2^x$ is?

asked Jul 15, 2013 by rvidyagovindarajan_1

1 answer

The complex number $z$ satisfying the equation $arg\large(\frac{z-1}{z+1})=\frac{\pi}{4}$ represents ?

asked Jul 15, 2013 by rvidyagovindarajan_1

1 answer

If $arg(z)<0$, then $arg(-z)-arg(z)$ = ?

asked Jul 15, 2013 by rvidyagovindarajan_1

1 answer

If the complex numbers $sinx+icos2x$ and $cosx-isin2x$ are conjugate to each other, then $x=?$

asked Jul 15, 2013 by rvidyagovindarajan_1

1 answer

$z+\overline z=0$ if and only if

asked Jul 15, 2013 by rvidyagovindarajan_1

1 answer

A particle moves on a rough horizontal ground with some initial velocity $V_0$. If $\large\frac{3}{4}$th of its kinetic energy is lost in friction in time $t_0$ the coefficient of friction is

asked Jul 15, 2013 by meena.p

1 answer

A small mass is hung from the ceilling of a train compartment. The train moves up an incline of $30 ^{\circ}$ with horizontal. Acceleration of train up the incline is $a=\large\frac{g}{2}.$ The angle with which the string supporting the mass makes with normal to ceiling in equilibrium

asked Jul 15, 2013 by meena.p

1 answer

A body is placed on rough inclined plane of inclination $\theta$. As angle $\theta$ is increased from $0^{\circ}$ to $ 90^{\circ}$ the contact force between the block and plane

asked Jul 15, 2013 by meena.p

1 answer

A block of mass $5 kg$ lies on a horizontal table. A force of $19.6 N$ is enough to keep the body sliding at uniform speed. The coefficient of sliding friction

asked Jul 15, 2013 by meena.p

1 answer

If rope of lift suddenly breaks the tension exerted by surface of the lift, where a is acceleration of the lift is

asked Jul 15, 2013 by meena.p

1 answer

A monkey of mass $20\; kg$ is holding a vertical rope. The rope will not break when mass of $25\; kg$ is suspended from it. but will break if the mass exceeds $25\; kg$. what is the accelerations (maximum) with which the monkey can climb up along the rope. $(g=10 m/s^2)$

asked Jul 15, 2013 by meena.p

1 answer

A $30\; g$ bullet initially travelling at $120 \;m/s$ penetrates $12\; cm$, into a wooden block. The average resistance exerted by block is

asked Jul 15, 2013 by meena.p

1 answer

A car of 1000 kg with velocity 18 km/hr is stopped by brake of 1000 N. distance covered by it before stopping is

asked Jul 15, 2013 by meena.p

1 answer

Three forces acting on a body as shown. To have resultant force only along y-direction, the magnitude of the minimum additional force needed is

asked Jul 15, 2013 by meena.p

1 answer

A block rests on a rough inclined plane making an angle of $30 ^{\circ}$ with the horizontal. The coefficient of static friction between block and the plane is 0.8. If the frictional force on the block is 10 N, the mass of block is $(g=10 m/s^2)$

asked Jul 15, 2013 by meena.p

1 answer

A particle of mass $0.3 kg$ is subjected to a force $F=-kx$ with $k=15 N/m$. What will be its initial acceleration if it is released from a point $20 cm$ away from orgin?

asked Jul 15, 2013 by meena.p

1 answer

The upper half of an inclined plane with inclination of $\phi$ is perfectly smooth while the lower half is rough. A body starting from rest at top will again come to rest at bottom if coefficient of friction for lower half is given by

asked Jul 15, 2013 by meena.p

1 answer

Sand is dropped on a conveyor belt at rate of M kg/s Force necessary to keep the belt moving with a constant velocity v m/s will be

asked Jul 15, 2013 by meena.p

1 answer

The position x of a body of mass 2 kg various with time as $x=2t^2+3t-4$. Find the force acting on the body

asked Jul 15, 2013 by meena.p

1 answer

If the ratio of the roots of $ax^2+bx+c=0$ is equal to the ratio of the roots of $px^2+qx+r=0$ and if $D_1,\:D_2$ are their discriminants respectively, then $D_1:D_2=?$

asked Jul 14, 2013 by rvidyagovindarajan_1

1 answer

If the roots of the equation $x^2-4x-log_3 a=0$ are real, then the least value of $a$ is ?

asked Jul 14, 2013 by rvidyagovindarajan_1

1 answer

Two blocks are in contact on a frictionless table. One has mass m and another mass '2m'. A force F is applied on '2m' as shown. Now the force F is applied on 'm' from right. In the two cases respectively the ratio of force of contact between the blocks is

asked Jul 14, 2013 by meena.p

2 answers

A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at $2 m/s^2 $. He reaches the ground with a speed of 3 m/s. At what height, did he bail out $(g=10 m/s^2)$

asked Jul 14, 2013 by meena.p

1 answer

A body is suspended by a string from the ceiling of an elevator. It is observed that the tension in the string is doubled when the elevator is accelerated. The acceleration will be

asked Jul 14, 2013 by meena.p

1 answer

If the roots of the equation $x^3+bx^2+cx-1=0$ form an increasing G.P., then $b$ lies in which interval?

asked Jul 13, 2013 by rvidyagovindarajan_1

1 answer

A 600 kg rocket is set for a vertical firing. If the exhaust speed is 1000 m/s. The mass of gas ejected per second to supply the thrust needed to overcome the weight of the rocket is

asked Jul 13, 2013 by meena.p

1 answer

The contact force exerted by a body A on another body is equal to the normal force between the bodies, we conclude that 1) surface must be smooth 2)force of friction between two bodies may be equal to zero 3) magnitude of normal reaction is equal to that of friction 4) bodies may be rough

asked Jul 13, 2013 by meena.p

1 answer

Two cars of unequal masses use similar tyres if they are moving at same initial speed. the minimum stopping distance

asked Jul 12, 2013 by meena.p

1 answer

A body of 0.02 kg falling from height 5 m into a pile of sand.The body penetrates the sand a distance of 5cm before stopping what force has the sand exerted on the body?

asked Jul 12, 2013 by meena.p

1 answer

If $z_1\:\:and\:\:z_2$ are non zero complex numbers such that $|z_1+z_2|=|z_1|+|z_2|$, then $arg z_1-arg z_2=?$

asked Jul 12, 2013 by rvidyagovindarajan_1

1 answer

A mass of 10 kg is hung to a spring balance in lift. If the lift is moving with an acceleration g/3 in upward and downward directions. choose the correct option related to the reading of the spring balance 1)13.3 kg ,2)6.67 kg, 3) 32.6 kg, 4) 0

asked Jul 12, 2013 by meena.p

1 answer

If $\alpha\:\:and\:\:\beta$ are the roots of $2x^2-2(1+n^2)x+(1+n^2+n^4)=0$, then the value of $\alpha^2+\beta^2=?$

asked Jul 12, 2013 by rvidyagovindarajan_1

1 answer

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