A whistle is revolved with high speed in a horizontal circle of radius R. to an observer at the centre of the circle the frequency of the whistle will appear to be:
A person holds a bucket of weight 60N. He walks 7 m along the horizontal path and then climbs up a vertical distance of 5 m. The work done by the man is:
The electron is a cathode-ray tube are accelerated from cathode to anode by a potential differenceof
2000 V. If this p.d is increased to 8000 V, the electrons will arrive at the anode with:
A body of mass m having an initial velocity v, makes head on elastic collision with a stationary body of mass
m. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will
happen only when:
Between the plates of a parallel plate condenser there is 1mm thick paper of dielectric constant 4. Itis
charged at 100 volt. The electric field in volt/meter between the plates of the capacitor is:
