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A thin uniform rectangular sign hangs vertically above the door of a shop. The sign is hinged to a stationary horizontal rod along its top edge. The mass of the sign is 2.40 kg and its vertical dimension is 50.0 cm. The sign is swinging without friction, becoming a tempting target for children armed with snowballs. The maximum angular displacement of the sign is 25.0degress on both sides of the vertical. At a moment when the sign is vertical and moving to the left, a snowball of mass 400 g, traveling horizontally with a velocity of 160 cm/s to the right, strikes perpendicularly the lower edge of the sign and sticks there. (a) Calculate the angular speed of the sign immediately before the impact. (b) Calculate its angular speed immediately after the impact. (c) The spattered sign will swing up through what maximum angle?
Describe "Reverberation time" and "Absorption coefficient". Illustrate Sabine's formula for reverberation time in a closed auditorium.
Graviton has spin equal 2, how much of transfer motion of CPH changes to keep its spin equal 2? Answer; since we know in quantum mechanics primary spin defined by;
What is Fresnel explanation of optical activity
A disc of mass m and radius R is attached to a rectangular plate of the similar mass breadth R and length 2R . Find moment of inertia of this system about diameter of disc. They ar
Q. The half life of radon is 3.8 days. Calculate mean life. Half Life Period HLP T ½ = 0.6931 / λ = 0.6931 τ therefore Mean life τ = T ½ / 0.
Surface tension can be explained in given possible ways: (i) The property of a liquid on account of which it tends to keep minimum number of molecules in its free surface is d
AC Input Resistance in Common Emitter Configuration Ratio of change in base emitter voltage ( ? V BE ) to the resulting change in base current ( ? I B ) at cons
Q. Find the minimum wavelength of X-rays produced by an X-ray tube operating at 1000 kV. λmin = 12400 A 0 / V Therefore λmin = 12400 X 10 -10 / 10 6 = 0.0124 A 0
Give any two methods of electric lines of force. Sketch them for an isolated positive point charge.
It is based on the principle that conductivity of a semiconductor enhances with increase in the intensity of incident light. In this, a thin layer of some semiconductor (as
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