An inventor tries to sell you his new heat engine that takes in 40 J of heat at 87°C on each cycle, expels 30 J at 27°C, and does 10 J of work. Would it be wise to invest in this engine? Back up your conclusion with numerical calculations
What will be an ideal response?
Save your money! He has claimed an efficiency of 25%, but the greatest possible efficiency for an engine operating between these temperatures is only 17%, for a Carnot engine.
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Exhibit 12-3
The graph below shows a plot of angular velocity in rad/s versus time in s from t = 0 s to t = 7 s.
?
?
Use this exhibit to answer the following question(s).
Refer to . The change in angular position, ??, during the 7-second period is
a.
21 rad, CW.
b.
21 rad, CCW.
c.
30 rad, CW.
d.
30 rad, CCW.
e.
39 rad, CCW.
Planetary orbits are
a. parabolas c. circles b. ellipses d. none of the above.
A steel pipe column (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm, and d1 = 70 mm) of length L 5 4.25 m is subjected to a temperature increase DT. The column is pinned at the top and fixed at the bottom. The tem- perature increase at which the column will buckle is approximately:
(A) 36 8C
(B) 42 8C
(C) 54 8C
(D) 58 8C
The product of the wavelength times the frequency of a wave is its ________
Fill in the blank(s) with correct word