Related InterviewSolutions

• A mass m moving with a constant velocity along a line parallel to the axis, away from the origin. Its anguarl momentum with respect to the originA. is zero when it is verticalB. remain constantC. goes on increasingD. goes on decreasing
• The line of action of the resultant of two like parallel forces shifts by one-fourth of the distance between the forces when the two forces are interchanged. The ratio of the two forces is:A. `1:2`B. `2:3`C. `3:4`D. `3:5`
• A man spinning in free space changes the shape of his body, eg. By spreading his arms or curling up. By doing this, he can change his.A. moment of inertiaB. angular momentumC. angular velocityD. rotational kinetic energy
• In the previous question, the angular frequency of the simple harmonic motion is `omega`. The coefficient of friction between the coin and the platform is `mu`. The amplitude of oscillation is gradually increased. The coin will begin to slip on the platform for the first time (i) at the extreme positions of oscillations (ii) at the mean position (iii) for an amplitude of `(mug)/(omega^2)` (iv) for an amplitude of `(g)/(muomega^2)`A. at the extreme position of oscillationB. at the mean positionC. for an amplitude of `mug//omega^(2)`D. for an amplitude of `g//muomega^(2)`
• A man standing on a platform holds weights in his outstretched arms. The system is rotated about a central vertical axis. If the man now pulls the weights inwards close to his body thenA. the angular velocity of the system will increaseB. the angular momentum of the system will decreaseC. the kinetic energy of the system will increaseD. he will have to expand some energy to draw the weights in
• A coin is placed on a horizontal platform which undergoes vertical simple harmonic motion of angular frequency `omega`. The amplitude of oscillation is gradually increased. The coin will leave contact with the platform for the first timeA. at the highest position of the platformB. at the mean position of the platformC. for an amplitude of `g//omega^(2)`D. for an amplitude of `sqrt(g) //omega`
• A particle of mass m is fixed to me one end of a light right rod of length l and rotated in a vertical circular path about its other end. The minmum speed of the particle at its highest point must beA. zeroB. `sqrt(gl)`C. `sqrt(1.5gl)`D. `sqrt(2gl)`
• A spring block system undergoes SHM on a smooth horizontal surface, the block is now given some charge and a uniform horizontal electric field E is switched on as shown in Fig. As a resultA. the time period of oscillation will increaseB. the time period of oscillation will decreaseC. the time period of oscillation will remain unaffectedD. the mean position of simple harmonic motion will shift to the right
• A simple pendulum has a time period T. The bob is now given some positive charge – (1) If some positive charge is placed at the point of suspension, T will increases (2) If some positive charge is placed at the point of suspension, T will not change (3) If a uniform downward electric field is switched on, T will increase (4) If a uniform downward electric field is switched on, T will decreaseA. If some positive charge is placed at the point of suspension, T will increase.B. If some positive charge is placed at the point of suspension, T will not changeC. If a uniform downward electric field is switched on , T will increase.D. If a uniform downward electric field is switched on , T will decrease.
• There are some passeger inside a stationary railway compartment. The centre of mass of the compartment itself (without the passngers) is `C_(1)` while the centre of mass of the compartment plus passengers system is `C_(2)` if passenger move about inside the comparmentA. both `C_(1)` and `C_(2)` will move with respect to the groudB. neither `C_(1)` nor `C_(2)` will move with respect to the groundC. `C_(1)` will move but `C_(2)` will be stationary with respect to the groundD. `C_(2)` will move but `C_(1)` will be stationary with respect to the ground