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Reducing friction by an air stream
Cut out a disc of cardboard about 10 cm in diameter. With a red-hot pin, burn a hole by the centre. Saw a small cotton reel in half and glue the unique end of one half over the middle of the disc. Search a piece of bamboo or some other tube which just fits the hole in the reel. Push this into the neck of a small balloon, using cotton or a rubber band to protected the joint.
Friction by an air stream
State the importance of emission and absorption spectra. Derive the mathematical expression for refractive index of material of the prism.
Derive the equation of uniformly acceleration motion by analytical method.
Q. What is an optical fibre and dispersion? Write the expression for angle of deviation.
explain briefly voltaic cell
A reaction is first order in A and second order in B. (a) Write differential rate equation. (b) How is the rate affected if the concentration of B is tripled? (c) How is
It explains that when an object is immersed partly or completely in a liquid, it loses in weight similar to the weight of the liquid displaced by it. Let w1 be weight of an obje
What do you understand by reverberation time an auditorium What do you mean by sound absorber. Give two examples for good absorbers.
A beaker of water sits in the sun until it reaches an equilibrium temperature of 30°C. The beaker is made of 100 g of aluminum and contains 170 g of water. In an attempt to cool th
Characteristics of resistances connected in parallel
what is the magnetic field at a distance l from the centre of the circle of radius r which carries a current i
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