A steam engine is operating at its theoretical maximum efficiency of 60%. If the waste heat has a temperature of 100°F (38°C), what is the temperature of the boiler?
a. 350°C
b. 94°C
c. 225°C
d. 504°C
e. 775°C
d
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Using ________ incidence optics, the Chandra is the X-ray equivalent of the HST
Fill in the blank(s) with correct word
A 5.0-liter gas tank holds 1.4 moles of helium (He) and 0.70 moles of oxygen (O2 ), at a temperature of 260 K
The atomic masses of helium and oxygen are 4.0 g/mol and 16.0 g/mol, respectively. Avogadro's number is 6.022 × 1023 molecules/mol and the Boltzmann constant is 1.38 × 10-23 J/K. The total random translational kinetic energy of the gas in the tank is closest to A) 6.8 kJ. B) 6.1 kJ. C) 7.6 kJ. D) 8.3 kJ. E) 9.1 kJ.
A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s2 . What is its angular speed after this 7.0-s interval?
a. 0.20 rad/s b. 0.30 rad/s c. 0.46 rad/s d. 0.78 rad/s
Regarding the validity of Ptolemy's and Copernicus' theories:
A) Ptolemy was proven wrong and Copernicus was proven right. B) they were both good theories, but Ptolemy's point of view ultimately turned out to be more useful. C) the experimental facts known in Copernicus' time tended to support Copernicus' theory over Ptolemy's. D) they were both wrong and useless theories. E) they were both good theories, but Copernicus' point of view ultimately turned out to be more useful.