
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 ...

Three identical spheres of mass 1 kg are placed touching each other with their centers on a straight line. Their centers are marked K,L and M respectively. What is the distance of the center of mass of the system from K? ...

What is the meaning of Î¼Î¼C? ...

Two point masses m and M are separated by a distance L. What is the distance of the center of mass of the system from m? ...

A 60kg body is pushed with enough force to start it moving across a floor and it continues to act afterwards. The coefficient of static friction is 0.5 and the coefficient of sliding friction is 0.4 . Calculate the accelerati ...

A particle of mass m is executing uniform circular motion on a path of radius r. If p is the magnitude of its linear momentum,calculate the radial force acting on the particle. ...

A particle moves along a circle of radius (20/Ï€)m with constant tangential acceleration. If the velocity of the particle is 80 m/s at the end of the second revolution after motion has begun,what is the tangential acceleratio ...

A motorcyclist starts from the bottom of a slope of angle 45Â° to cross a valley. The width of the valley 90m and length of the slope is 80 2 m. What is the minimum value of u (initial velocity)? ...

A cannon ball is fired with a velocity v such that it makes an angle Î¸ 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. ...

two conducting spheres of radii r1 and r2 have charge q1 and q2 respectively.after bringing them in contact,what happens to the energy of the system? a)no change b)increase if q1r2â‰ q2r1 c)decrease always d)decrease if q1r2â ...

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 Î¸ with the surface of the incline.The angle of the inclined plane is 45.For what value of Î¸ will the particle retrace it's path after collision with t ...

*Image* ...

{Shastras Q21} 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 ...

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 ...

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 ...

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

While cycling direction of friction: a) Towards direction of cycling b) Opposite to direction of cycling c) Different on the different wheels d) None of the above. ...

Why does the value of Î¼ change for static friction and kinetic friction? Thanks to the person who can help me in advance. Thanks, Bye, Angikar ...

A ball is thrown upward at a velocity of 19.6 m/s.Â 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 ...

The secondâ€™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 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 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 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. ...

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. ...

The velocity of a train increases at a constant rate Î± from zero to v and then remains constant for an interval and finally decreases to zero at a constant rate Î². If x be the total distance covered,find the total time take ...

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 ...

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 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? ...