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Define the Tea in Thermos?
One liter of tea at 90° C is poured keen on a vacuum-insulated container (thermos). The surface area of the thermos walls A=600 cm2. The volume among the walls is pumped down to Po~ 5.10-6 atm pressure (at room temperature). The emissivity of the thermal and the walls capacity of water C = 4.2.103 J/kg K. ignore the heat leakage through the stopper, estimate the
a) Net power transfer
b) Time for the tea to cool from 90°C to 70°C.
Regard as two charged particles. At a given separation every particle exerts a force of 12 N on the other. What force does every one exert on the other after someone moves the part
michelson interferometer principle
How a CPH products? Answer; no time has passing of a CPH. Thus, CPH exists and never decay.
Image Formation for Concave Mirrors - Case A To look an object within any type of mirror, a person must sight along a line at the image of the object. Whole persons capable of
Mica is a (A) Dielectric material. (B) Insulating material. (C) Magnetic material. (D) Both insulating and dielectric material. Ans: Mica is a both insulating and
what is torsion of cylinder ?
LIST DIFFRENT THEM
An object that is 24 cm from a convex lens produces a real image that is 13 cm from the lens. What is the focal length of the lens?
What is beats
Q. A neutral Ping Pong ball dangles from the ceiling by a thread. A person chafes a rubber rod with animal fur and then touches the Ping Pong ball with the rubber rod. Afterwar
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