A soap bubble with air on both sides has an index of refraction of 1.33. What minimum thickness of the wall of this bubble will ensure maximum reflectance of normally incident light having a wavelength of 530 nm?
What will be an ideal response?
99.6 nm
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A two-shell-four-tube-pass heat exchanger has an overall heat exchanger conductance of 350 W/m^2?K and is used to cool 10 kg/s of engine oil from 180ºC to 80ºC. If water at 20ºC is used to cool the oil and the water temperature leaving the heat exchanger is 60ºC, determine (a) mass flow of water required and (b) surface area of the heat exchanger.
What will be an ideal response?
In the context of luminosity classes,__________is a subgiant (IV)
A) Altair B) Rigel C) Polaris D) Adhara
If the net force on a body is zero, the net torque on the body is
A. not necessarily zero. B. always zero. C. certainly not zero.
Based on observations by the Dawn spacecraft, scientists have concluded that Vesta might be:
A) a planetesimal leftover from the solar system's formation. B) the only remaining protoplanet in our solar system. C) one of the dwarf planets in our solar system. D) a fragment of Mars. E) one of the remnants of the planet that broke up to form the asteroid belt.