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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.
Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.
A simple pendulum of frequency f has a metal bob.If the bob us negatively charged and is allowed to oscillate with a posively charged plate under it , the frequency will.? Ans) DUE
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1. What is the principle of gas filled detectors? 2. What are nuclear radiations or particle detectors?
how proton electron hypothesis is rejectrd on the basis of nuclear magnetic dipole moment?
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