Calculate the energy En (in eV) of a hydrogen atom's electron with n = 4
a. –54 eV
b. –3.4 eV
c. –0.85 eV
d. –1.7 eV
c
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Air at 100ºF, 70% relative humidity is to be conditioned to 75ºF and 60% relative humidity. Determine the partial pressure of the water vapor in the air at both states, the amount of water removed per lbm of dry air, and the lowest temperature to which the air must be cooled to accomplish this conditioning process.
What will be an ideal response?
A railroad freight car, mass 15 000 kg, is allowed to coast along a level track at a speed of 3.0 m/s. It collides and couples with a 54 000-kg loaded second car, initially at rest and with brakes released. What percentage of the initial kinetic energy of the 15 000-kg car is preserved in the two-coupled cars after collision?
a. 78% b. 22% c. 18% d. 38% e. 14%
The Sun's complete classification is G2V
Indicate whether the statement is true or false
An object is placed 21 cm from a concave lens having a focal length of magnitude 25 cm. What is the magnification?
A) -0.54 B) 0.54 C) -0.32 D) -0.22 E) 0.22