Frequent Physics Questions

A cannon ball is fired with a velocity v such that it makes an angle θ with the horizontal. At the highest point,the cannon ball splits into two parts of equal masses. One of the parts retraces the initial path of the ball. ...

A rod of length 10 m. is travelling on a smooth,level,horizontal surface.Beyond a point A,the floor ceases to be smooth and the coefficient of friction is k=0.1.The rod is travelling such that it is moving towards the point A ...

A particle is projected from the bottom of an inclined plane at an angle θ with the surface of the incline.The angle of the inclined plane is 45.For what value of θ will the particle retrace it's path after collision with t ...

A parallel plate capacitor of capacitance C is connected to a battery and is charged to a potential difference V. Another capacitor of capacitance 2C is similarly charged to a potential difference 2V. The charging battery is ...

A ball is thrown upward at a velocity of 19.6 m/s. What is its velocity after 3.00 s? a) 9.8 m/s upward b) 9.8 m/s downward c) zero d) 19.6 downward ...

Four point charges each of charge +q are rigidly fixed at the four corners of a square planar soap film of side a.The surface tension of the soap film is S.the system of charges and planar film are in equilibrium.Then find a ...

The second’s hand of a watch has length 6 cm. Speed of end point and magnitude of difference of velocities at two perpendicular positions will be a) 6.28 and 0 mm/s b) 8.88 and 4.44 mm/s c) 8.88 and 6.28 mm/s d) 6.28 and 8. ...

A boy standing in front of a wall at a distance of 85m produces 2claps/s. he notices that the sound of his clapping coincides with the echo. The echo is heard only once when clapping is stopped. V=? a) 330 m/s b) 340 m/s c) 3 ...

A particle is projected from a point A,whose position vector is 2i + 3j,with initial velocity vector 20i + 30j + 20k,where i and k are horizontal and j is the unit vector in the direction of the upwards vertical. Find a vecto ...

A gun is fired from a moving platform and the range of the shot is R when the platform is moving forward and S when the platform is moving backward. The velocity of the shot is V. Prove that the gun is elevated at an angle ta ...

Two particles move in an uniform gravitational field with acceleration g. Initially the particles were located at one point and moved with velocities v1 = 3m/s and v2 = 4m/s horizontally in opposite directions. Find the dista ...

The velocity of a train increases at a constant rate α from zero to v and then remains constant for an interval and finally decreases to zero at a constant rate β. If x be the total distance covered,find the total time take ...

A ball is dropped from the top of a building at t = 0. At a later time t = t0,a second ball is thrown downwards with initial speed v0. Using relative motion concept, find the time at which the two balls will meet. ...

A particle is projected from the origin in such a way that it passes through a given point P(a,b). What is the minimum speed required to do so? ...

A marble rolls off horizontally from the edge of the table and lands on the floor. 1)How long does the marble take to reach the floor? 2)At what horizontal distance from the edge of the table does the marble land? 3)What is t ...

If R be the range of a projectile on horizontal plane, and H1 and H2 be the maximum heights for its two possible trajectories,find the relation between the given parameters. ...

If I am Walking towards east,friction acting on me has a direction a.east b. west c. north d. none of the above your answer b correct answer a how? ...

How to find the potentials at points A,B,C,D,E,F. *Image* ...

{Shastras Q-21} a point charge q is brought from infinity and is placed at the center of a conducting neutral spherical shell of inner radius 'a' and outer radius 'b', then work done by external agent is. A}0 B}kq2/2b C}kq2/2 ...

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Why does a porter, carrying a heavy load on his back, bend forward? ...

In the Bohr model of a hydrogen atom, the centripetal force is furnished by the coulomb attraction between the proton and the electron. If {{a}_{0}} is the radius of the ground state orbit, m is the mass, e is the charge on t ...

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TWO CONDUCTING plates each of area A are separated by distance d and they are parallel to each other. A conducting medium of varying conductivity fills space between them. the conductivity varies linearly σ to 2σ as we move ...

An element having b atomic no and a mass no. under goes a α emission then a β emission simultaneously .. then the new values of atomic and mass no. is a) a-2, b-4 b) a-4,b-1 c) a-4,b-2 d) none ...

A 50-N object was lifted 2.0 m vertically and is being held there. How much work is being done in holding the box in this position? a) more than 100 J b) 100 J c) less than 100 J, but more than 0 J d) 0 J ...

A pump draws water from a tank and issues it from the end of a horse which is 2.5m vertically above the level from which the water is drawn. The cross sectional area of the hose is 10cm^{2} , and the water leaves the end of t ...

A force vec{F}=2hat{i}-3hat{j}+4hat{k} (N) acts on a particle which undergoes a displacement vec{r}=7hat{i}+3hat{j}-2hat{k} (M). Calculate the work done by the force a) 37 J b) -9 J c) 49 J d) 14 J ...

An object is lifted vertically 2.0 m and held there. If the object weighs 90 N, how much work was done in lifting it? a) 360 J b) 180 J c) 90 J d) 0 J ...

Condenser A has a capacity of 15 when it is filled with a medium of dielectric constant 15. Another condenser B has a capacity 1 with air between the plates. Both are charged separately by a battery of 100V. After charging, b ...