Physics Test 59...

A tube of length L is completely filled with an incompressible liquid of mass M and closed at both ends. The tube is rotated in a horizontal plane at one of its ends with uniform angular speed ''. What is the force exerted by the liquid at the other end is?

A stationary body of mass 3 kg explodes into three equal pieces. Two of the pieces fly off at right angles to each other. One with a velocity of  and the other with a veloctiy of  If the explosion takes place in 10⁻⁵s, the average force actingon the third piece in newtons is

A person travels along a straight road for the first half time with a velocity v₁ and for the second half time with a velocity v₂. The mean velocity ′V′ is given by

A train approaches a stationary observer, the velocity of train being 1/20 of the velocity of sound. A sharp blast is blown with the whistle of the engine at equal intervals of a sec. The interval between the successive blasts as heard by the observer is

A block released on a rough inclined plane of inclination =30^∘ slides down the plane with an acceleration g/4, where, g is the acceleration due to gravity. What is the coefficient of friction between the block and the inclined plane?

Two masses m₁ and m₂ are suspended together by a mass-less spring of spring constant K. When the masses are in equilibrium, m₁ is removed without disturbing the system. The angular frequency and amplitude of oscillation of m₂ are

Two small charged spheres A and B have charges 10µC and 940µC, respectively, and are held at a separation of 90 cm from each other. At what distance from A would the electric intensity be zero?

A source emitting wavelengths 480 nm and 600 nm is used in Young's Double Slit Experiment. The separation between the slits is 0.25 mm. The interference is observed 1.5 m away from the slits. The linear separation between first maxima of the two wavelengths is :

A motor having an armature of resistance 2Ω is designed to operate at 220 V mains. At full speed, it develops a back emf of 210 V. What is the current in the armature when the motor is running at full speed?