Mercury is heated from 100ºF to vapor at 800ºF. Assume hnfg is 122 Btu/lbm at 676ºF and use a cP of 0.032 Btu/lbm ·ºF for liquid mercury and 0.015 for the vapor. Determine the enthalpy change per unit mass and the heat per unit mass.
What will be an ideal response?
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Which of the following is not a good reason why white-dwarf supernovae are good standard candles for distance measurements?
A) White-dwarf supernovae are so bright that they can be detected even in very distant galaxies. B) All white-dwarf supernovae involve the explosion of stars of nearly the same mass. C) White-dwarf supernovae occur only among young and extremely bright stars. D) White-dwarf supernovae are common enough that we detect several every year. E) All white-dwarf supernovae have similar light curves, which makes them easy to distinguish from massive-star supernovae.
A 2-kg car moving towards the right at 4 m/s collides head on with an 8 kg car moving towards the left at 2 m/s, and they stick together. After the collision, the velocity of the combined bodies is __________ m/s pointing __________
Fill in the blank(s) with correct word
As a gust of wind blows across a field of grain, a wave can be seen to move across the field as the tops of the plants sway back and forth. This wave is a:
a. transverse wave. b. longitudinal wave. c. polarized wave. d. interference of waves.
In the electron cloud model, or quantum model, of the atom, the focus is on the ______________ nature of the electron
Fill in the blank(s) with correct word