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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.
Laboratory tweezers Very serviceable tweezers can be made from lengths of flexible strap iron used to place around boxes and creates for shipment. The tweezers shown are abo
Define Space Station Pressure (MIT)? A space station consists of a huge cylinder of radius Ro filled with air. The cylinder revolve about its symmetry axis at an angular spee
What are the merits of typical ultrasonic flaw detector? Merits of typical ultrasonic flaw detector: a. Particularly one side of the specimen is needed for the study. b.
Neutron possesses: (1)Positive charge (2)Negative charge (3)No charge (4)All are correct Ans: (3)No charge
Non- Linear circuit It can be described as that circuit whose parameters change with voltage or current.
examples of liked paralled forces
Lenz''s Law states that the Nature of induced emf in the coil is such that it opposes the causes of it. It can be explained by a simple understanding of Faraday EM induction exper
The electromagnetic wave is going in free space with electricvector . How much average energy is passing through a rectangular hole of length 3 cm and width 1.5 cm inxyand in yz pl
Define Ohm's Law Ohm's Law: Relationship among the potential difference across an electric device and the current that runs by it. V= I.R
CO has same electrons as or the ion that is isoelectronic with CO is: (1) N + 2 (b) CN - (3) O + 2 (4) O - 2
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