At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm
At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B?
A)
3.00
B)
0.167
C)
0.375
D)
0.333
E)
0.750
C
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A. at absolute zero. B. at 0°C. C. at 100°C. D. infinitely hot.
Silver has a Fermi level of 5.5 eV. At 0 K, what is the speed of the electrons with the Fermi speed?
A) 1.4 × 106 m/s B) 1100 m/s C) 2200 m/s D) 0 E) 1.1 × 106 m/s
Neutrons:
A) have double the mass of protons. B) are atomic particles with no charge. C) when equal in number form isotopes. D) exist independently and unattached to atoms.
Why have studies of the geological record not enabled us to determine how life on Earth originated?
A) the first living organisms would have left absolutely no trace of their existence B) life was planted on the Earth by an advanced civilization so there is no evidence in the geological record to find C) the geological record does not extend back to the time that life originated D) the oldest rocks are too deep inside the Earth for us to retrieve