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From the top of a building 40 m tall, a ball a thrown vertically upwards with a velocity of $10\; ms^{-1}$ After how long will the ball hit the ground?

answered Aug 13 by sl0224422

2 answers

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

answered Jul 13 by akashrao0005

2 answers

Minimum size of plane mirror, required to see full image of an observer is :

answered Jun 20 by parthgite94

2 answers

Find the dimension of physical quantity $X$ in the equation $Force=\large\frac{X}{Density}$

answered May 14 by muskaans095

2 answers

In the circuit as shown in the figure what is the potential difference between P and Q.

answered May 13 by nikunjjain285

1 answer

The trajectory of a projectile in a vertical plane is $y=ax-bx^2$ where $a$ and $b$ are constants. The maximum height attained by the particle and the angle of projection from horizontal are

answered Apr 24 by vipul.saini442

2 answers

Two identical particles , each having a charge of $\;2\times10^{-4}\;C\;$ and mass 10g are kept at a separation of 10 cm and released . What would be the speeds of the particles when the separation becomes large ?

answered Apr 19 by mahajanmridul1997

2 answers

electric charge Q,Q and -2Q resp. are placed at the three corners of an equilateral triangle of side a . magnitude of the elctrical dipole moment of the system is

answered Mar 23 by abdulsalamottathil

2 answers

a body is projected vertically upward from the earths surface such that it reaches a height equal to the radius of the earth above its surface.find the velocity of projection

answered Feb 3 by prekshu.02

1 answer

A 150m long train is moving with uniform velocity of 45km / h. The time taken by train to cross the bridge of length 850m is ?

answered Jan 29 by suchala2002

3 answers

Dhoni throws his bat vertically upwards with an initial velocity of $26.2\;m/s$ Determine the height to which the bat will rise above its initial height.

answered Aug 14, 2016 by donkadasnd

2 answers

Two identical charged spheres are suspended by strings of equal length . The strings make an angle of $\;60^{0}\;$ with each other . When suspended in a liquid of density $\;0.5 g/cc,\;$ the angle remains the same . The dielectric constant of the liquid is [density of material of sphere is $\;1.5 g/cc\;$]

answered Jun 24, 2016 by dongrearchit

2 answers

Two identical ladders are arranged as shown in the figure, resting on a horizontal surface. Mass of each ladder is M and length L. A block of mass m hangs from the apex point P. If the system is in equilibrium, find direction and magnitude of friction force acting at A or B.

answered Apr 1, 2016 by vijayalakshmi.r

1 answer

A particle of mass m is travelling with a constant velocity $\overrightarrow {V} =V_0 \hat i$ along the line $y=b,z=0$. Let $dA$ be the area swept out by the position vector from the origin to the particle in time at end L be the magnitude of angular momentum of particle about orgin at any time t. Then 1) L= constant 2) $\large\frac{dA}{dt}=\frac{L}{m}$ 3) $\large\frac{dA}{dt}= \frac{2L}{m}$ 4) $\large\frac{dA}{dt}=\frac{L}{2m}$ Which of the following is correct?

answered Apr 1, 2016 by vijayalakshmi.r

1 answer

If the error in the measurement of radius of a sphere is 2%, then the error in the determination of volume of the sphere will be :

answered Feb 12, 2016 by _1

1 answer

Six equal resistance are connected between point P,Q,R as shown in the fig. Then the net resistance will be maximum between

answered Feb 8, 2016 by meena.p

1 answer

A solenoid carrying a current supplied by a DC source with constant emf contains iron rod inside it. when the rod is pulled out of the solenoid , then the current in the solenoid will

answered Feb 8, 2016 by meena.p

1 answer

In an AC circuit V and I are given by $V=100 \sin (100 t) volt \; I =100 \sin (100 t +\large\frac{\pi}{3})amp$ the power dissipated in the circuit is

answered Feb 8, 2016 by meena.p

1 answer

An aeroplane is moving north horizontally , with a speed of $200 ms^{-1}$ ,at a place where the vertical component of the earth's magnetic field is $ 0.5 \times 10^{-4}\;T$ .What is the induced e.m.f set up between the tips of the wings, if they are 10 m apart ?

answered Feb 8, 2016 by meena.p

1 answer

If vectors $\overrightarrow{A} = \cos wt \hat i +\sin w + \hat j$ and $\overrightarrow{B} = \cos wt/2 \hat i +\sin wt/2 + \hat j$ are functions of time , then the value of t at which are orthogonal to each other is

answered Feb 8, 2016 by meena.p

1 answer

A child is standing with his two arms outstretched at the center of a turntable that is rotating about its central axis with an angular speed $w_0$ Now the child folds his hands back so that the moment of inertia becomes 3 times the intial values.The new angular speed is

answered Feb 8, 2016 by meena.p

1 answer

Three planets of same density and with radii $R_1,R_2$ and $R_3$ Such that $R_1=2R_2=3R_3$, have gravitational fields on the surfaces $E_1,E_2,E_3$ and escape velocities $v_1,v_2,v_3$ respectively ,then

answered Feb 8, 2016 by meena.p

1 answer

A block of wood floats in water with $\large\frac{4}{5}$ th of its volume submerged , but it just floats in a liquid . What is the density of the liquid ?

answered Feb 8, 2016 by meena.p

1 answer

A clock with an iron pendulum beeps correct time at $15 ^{\circ}c$ what will be the error in time per day , if the room temperature is $20^{\circ}$?

answered Feb 8, 2016 by meena.p

1 answer

A charge q is placed at the centroid of an equilateral triangle. Three charges equal to Q are placed at the vertices of the triangle . The system of the four charges will be in equilibrium . if q is equal to

answered Feb 8, 2016 by meena.p

1 answer

Two H atoms in the ground state collide elastically. The maximum amount by which their combined kinetic energy reduced is

answered Feb 8, 2016 by meena.p

1 answer

The total energy in the ground state of hydrogen atom is $ -13.6\;eV$ . The kinetic energy of this electron in first excited state is :

answered Feb 8, 2016 by meena.p

1 answer

Ina common emitter configuration, a transistor have $\beta= 50$ and input resistance $1k \omega$ . If the peak value of a.c input is $0.01\;V$ then the peak value of collector current is

answered Feb 8, 2016 by meena.p

1 answer

A ratio station has two channels . one is AM at $1020 kHz$ and the other FM at $89.5$ MHz. For good results you will use

answered Feb 8, 2016 by meena.p

1 answer

A ball is dropped to the ground from a height of 8 m. The coefficient of restitution is 0.5 . To what height will the ball rebound?

answered Feb 8, 2016 by meena.p

1 answer

An astronaut is looking down on Earth's surface from a space shuttle at an attitude of 400 km. Assuming that the assonants pupil diameter is 5 mm and wave length of visible light is 500 nm, the assonant will be able to resolve linear objects of the size of about

answered Feb 8, 2016 by meena.p

1 answer

The second overtone of an openpipe has the same frequency as the first overtone of a closed pipe 2m long . Calculate the length of the open pipe .

answered Feb 8, 2016 by meena.p

1 answer

A horizontal platform with an object placed on it is executing is $3.92 \times 10^{-3}$ what must least period of these oscillation , So that the object is not detached from the platform?

answered Feb 8, 2016 by meena.p

1 answer

A parallel plate capacitor c with plates of unit area and separation d is filled with a liquid of dielectric constant $k=2$ The level of the liquid is$\large\frac{d}{3}$ initially . Suppose the liquid level decreases at constant speed V, the time constant as a function of time t is

answered Feb 8, 2016 by meena.p

1 answer

The work done in turning a magnet of magnetic moment by an angle of $90^{\circ}$ from the meridian is n times the corresponding work done to turn it through an angle of $60^{\circ}$ . The value of n is given by

answered Feb 8, 2016 by meena.p

1 answer

A conductivity loop in the form of a circle is placed in a uniform magnetic field with its plane perpendicular to the direction of the field. An e.m.f will be included in the loop if

answered Feb 8, 2016 by meena.p

1 answer

An objects is located 4 m from the first of two thin covering lenses of focal length 2 m and respectively . The lenses are separated by 3 m. The final image formed by the second less is located from the source ata distance if :

answered Feb 8, 2016 by meena.p

1 answer

A Tv transmitting antenna is $128$ m tall. If the reactivating antenna is at the ground level, the maximum distance between them for satisfactory communication is LOS mode is (R of earth $=6.4 \times 10^6 m)$

answered Feb 8, 2016 by meena.p

1 answer

A person carrying a whistle entitling continuously a note of 272 Hz is running towards a reflecting surface with a speed of $18 km h^{-1}$. The speed of sound in air is $345 ms^{-1}$ The number of beats heard by him is

answered Feb 8, 2016 by meena.p

1 answer

In the circuit shown in the fig the battery is ideal. A voltmeter of resistance $600 \Omega$ is connected in turn across $R_1$ and $R_2$ , giving reading $V_1$ and $V_2$ respectively . Then

answered Feb 8, 2016 by meena.p

1 answer

Two deuterium nuclei each of mass m, fuse together to form a helium nucleus , releasing an energy E. If C is the velocity of light , the mass of helium nucleus formed will be

answered Feb 8, 2016 by meena.p

1 answer

A boat which has a speed of $5\;kmh^{-1}$ in still water crosses a river of width 1 km along the shortest possible path in 15 mints . The velocity the river water in kmh^{-1} is

answered Feb 8, 2016 by meena.p

1 answer

A resister of $500 \Omega$ an inductance of $0.5$ H are in series with an ac which is given by $v= 100 \sqrt 2 \sin (1000 t)$. The passer factor of the combination is :

answered Feb 8, 2016 by meena.p

1 answer

The base current of transistor is $100 \mu A$ and the collector current is $2mA$ . What is the current gain for the common base configuration ?

answered Feb 8, 2016 by meena.p

1 answer

The moment of inertia of the system of four spheres about the side AD, when four solid spheres each of mass m and radius r are located with their centers on four corners of a square ABCD of slide a is :

answered Feb 8, 2016 by meena.p

1 answer

A cable that weighs 1.5 kg/meter and is attached to a bucket that weighs 75 kg. Initially, there are 500 kg of grain in the bucket and as the bucket is raised 2 kg of grain leaks out of a hole in the bucket for every meter the bucket is raised. The bucket is 200 meters below a bridge. How much work is required to raise the bucket to the top of the bridge?

answered Dec 21, 2015 by vijayalakshmi.r

1 answer

If we have a cylinder container of radius R and height h is completely filled with a liquid . There are two horizontal L shaped pipes of small cross section 'a' are connected to the cylinder . Now if the two pipes are opened . Then torque would be applied by the liquid is ?

answered Dec 21, 2015 by vijayalakshmi.r

1 answer

A spherical hole is made in a solid sphere of radius R. the mass of the sphere before hollowing was M. The gravitational field at the centre of the hole due to the remaining mass is

answered Dec 14, 2015 by vijayalakshmi.r

1 answer

Six charges are placed at the vertices of a rectangular hexagon as shown in fig. The electric field on the line passing through point O and perpendicular to the plane of the figure as a function of X from point O is (x>>>a)

asked Aug 1, 2015 by _1

1 answer

a body dropped freely from a height h on to a horizontal plane, bounces up and down and finally comes to rest. the coefficient of restitution is e. the ratio of velocities at the beginning and after two rebounds is

asked Jul 28, 2015 by excellentdeals18

1 answer

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