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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When two elements form a eutectic phase diagram, in the eutectic reaction the atoms of the solid elements _____________.
Fill in the blank(s) with the appropriate word(s).
The observable ________ is a thin layer of the Sun in which the solar material becomes suddenly much more opaque as we look deeper into the Sun
Fill in the blank(s) with correct word
Why does ion propulsion, which expels material much faster than ordinary chemical rockets, hold such promise for future space travel?
What will be an ideal response?
The electric field at a point 2.8 cm from a small object points toward the object with a strength of 180,000 N/C. What is the object's charge q? (k = 1/4??0 = 8.99 × 109 N ? m2/C2 )
A) -16 nC B) +16 nC C) -17 nC D) +17 nC