A company that produces pulsed gas heaters claims their efficiency is approximately 90%. If an engine operates between 250°C and 25°C, what is its maximum thermodynamic efficiency?
a. 83%
b. 65%
c. 43%
d. 90%
e. 56%
c
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A container has a large cylindrical lower part with a long thin cylindrical neck. The lower part of the container holds 12.5 
of water and the surface area of the bottom of the container is 5.00 
The height of the lower part of the container is 2.50 m and the neck contains a column of water 8.50 m high. The total volume of the column of water in the neck is 0.200 
What is the magnitude of the force exerted by the water on the bottom of the container?
A. 
B. 
C. 
D. 
White-light LEDs employ
A) phosphors. B) white-emitting diodes. C) extra-high electrical barriers. D) none of the above
Which of the choices below correctly lists things in order from largest to smallest?
A) Sun, Earth, Solar System, Milky Way, Universe B) Universe, Milky Way, Sun, Earth, Solar System C) Solar System, Earth, Sun, Universe, Milky Way D) Universe, Milky Way, Solar System, Sun, Earth E) Milky Way, Universe, Solar System, Sun, Earth
The Concorde's exterior is made of aluminum, which has a coefficient of linear expansion of 24 × 10-6 K-1. At 15°C, the Concorde measures 62.1 m in length
When the plane is in flight, friction with the air increases the temperature of the exterior skin to 200°C. What is the change in the length of the outer skin of the Concorde? A) 20 cm B) 24 cm C) 28 cm D) 32 cm E) 36 cm