The Sun is at the autumnal equinox on ______________
Fill in the blank(s) with correct word
September 21
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A two-shell-eight-tube-pass heat exchanger condenses 3 kg/s of ammonia at 45ºC using 65 kg/s of water at 20ºC. If the ammonia enters as saturated vapor, leaves as saturated liquid, and has a heat of vaporization of 1078 kJ/kg, determine (a) outlet water temperature and (b) heat exchanger effectiveness.
What will be an ideal response?
Upon being struck by 240-nm photons, a metal ejects electrons with a maximum kinetic energy of 1.45 eV. What is the work function of this metal? (h = 6.626 × 10-34 J • s, c = 3.00 × 108 m/s, 1 eV = 1.60 × 10-19 J)
A) 3.73 eV B) 3.13 eV C) 4.33 eV D) 4.92 eV
Intensity: Calculate the light intensity 1.45 m from a light bulb that radiates 100 W equally in all directions.
A. 3.78 W/m2 B. 4.36 W/m2 C. 47.6 W/m2 D. 54.7 W/m2
You push your physics book across your desk, leaving the book at rest on the desk at the end of the process. Which of the following best represents the overall energy conversion during this process?
A) kinetic to thermal B) thermal to chemical C) chemical to electromagnetic D) chemical to thermal E) elastic to thermal