You are standing on a sidewalk. There is a car in the distance. The horn on the car sounds. You hear it at a pitch that corresponds to a sound frequency lower than the frequency emitted by the horn. What can you conclude?
A) The wind has a component of its velocity in a direction toward you.
B) The car is moving on a line directly away from your present location.
C) The wind has a component of its velocity in a direction away from you.
D) The car has a component of its velocity in a direction away from you.
E) Either A or C must be true.
D
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A shell and tube heat exchanger consists of one shell with 100 thin-walled tubes of 15 mm diameter in a double pass arrangement. The total surface area is 45 m^2 and the overall heat exchanger conductance is 200 W/m^2?K. Water enters the tubes at 15ºC and 6.5 kg/s. Hot gases having properties of air at 200ºC and 5 kg/s flow through the shell. Determine (a) gas outlet temperature and (b) water outlet temperature.
What will be an ideal response?
The circuit below contains three 100-watt light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) the brightest?
A. A B. B C. C D. B and C E. All three are equally bright.
If a person's eyeball is too short from front to back, the person is likely to suffer from
A) astigmatism. B) spherical aberration. C) chromatic aberration. D) farsightedness. E) nearsightedness.
A starship "Alpha" travels at 0.8c past an identical starship, "Beta," which is at rest. Both an engineer on the "Alpha" and a scientist on the "Beta" measure the length of the other ship as it passes by. Who measures the longer length?
A. The scientist B. Both measure the same length C. The engineer D. The measured lengths cannot be compared