Which of the following statements cannot be tested by science today?
A) Prior to the Planck time, our universe sprouted from another universe.
B) Our universe is flat.
C) The universe is 14 billion years old.
D) The expansion of the universe is now accelerating.
A) Prior to the Planck time, our universe sprouted from another universe.
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A simple compound microscope provides large magnification by employing
A) a short focal length objective and a short focal length eyepiece. B) a short focal length objective and a long focal length eyepiece. C) a long focal length objective and a short focal length eyepiece. D) a long focal length objective and a long focal length eyepiece.
If a galaxy's overall mass-to-light ratio is 100 solar masses per solar luminosity, and its stars account for only 5 solar masses per solar luminosity, how much of the galaxy's mass must be dark matter?
A) 100 percent B) 95 percent C) 80 percent D) 50 percent E) 5 percent
Which of the following are characteristics of a mass in simple harmonic motion?
I. The motion repeats at regular intervals. II. The motion is sinusoidal. III. The restoring force is proportional to the displacement from equilibrium. A) I and II only B) I and III only C) II and III only D) all of the above E) none of the above
In gas turbine recuperators, the exhaust gases are used to heat the incoming air and Cmin/Cmax is therefore approximately equal to unity. Show that for this case e = NTU/(1 + NTU) for counterflow and e = 1/2 (1 – e– 2NTU) for parallel flow.
GIVEN
• Gas turbine recuperator
• Cmin /Cmax ? 1
FIND Show that
(a) e = NTU/(1 + NTU) for counterflow
(b) e = 1/2 (1 – e– 2NTU) for parallel flow
SKETCH
