Two thermometers are calibrated, one in degrees Celsius and the other in degrees Fahrenheit. At what temperature (in kelvins) do their readings measure the same temperature?
a. 218.15
b. 233.15
c. 273.15
d. 40.15
e. 0
b
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The discoverer of X-rays was
A) Bragg. B) von Laue. C) Fermi. D) Roentgen. E) Xavier.
Which of the following quantities is conserved for a planet orbiting a star in a circular orbit? Only the planet itself is to be taken as the system; the star is not included
a. Momentum and energy. b. Energy and angular momentum. c. Momentum and angular momentum. d. Momentum, angular momentum and energy. e. None of the above.
In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.
What will be an ideal response?
Identical point charges (+30 ?C) are placed at the corners of a rectangle (4.0 m × 6.0 m). How much external energy is required to bring a charge of 55 ?C from infinity to the midpoint of one of the 6.0-m long sides of the rectangle?
A. 22 J B. 16 J C. 13 J D. 19 J E. 8.0 J