A rigid uniform bar of length 2.4 m is pivoted horizontally at its mid-point, weights are hung from two points
of the bar as shown in diagram. To maintain horizontal equilibrium, a couple is applied to the bar:
What is the torque and the direction of couple?
A parallel plate air capacitor is charged and then isolated. When a dielectric material is inserted
between the plates of the capacitor , then which of the following does not change:
A proton, accelerated through a p.d V has a certain de Broglie wavelength. In order to have the same de Broglie wavelength, an π βparticles must be accelerated through a potential difference:
Two 8 N forces act on each end of the beam of length 0.60m. Two forces are parallel and acting opposite to
each other, the angle between the force and beam is 60o
, what is the torque of the couple exerted on the
beam:
The uranium Nucleus πππ πΌ undergoes successive decays, emitting respectively π β πππ,π° β
πππ πππ β ππππ. What is the atomic number and atomic mass of the resulting nucleus:
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:
