The flow rate of a liquid through a 2.0-cm radius pipe is 0.016 m3/s. The average fluid speed in the pipe is:
a. 0.64 m/s.
c. 0.040 m/s.
b. 13 m/s.
d. 6.4 m/s.
B
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Why don't we see hydrogen Balmer lines in the spectra of stars with temperatures of 45,000 K?
a. There is no hydrogen in stars this hot. b. The stars are hot enough that most of the hydrogen is ionized and the atoms cannot absorb energy. c. These stars are so cool that nearly all of the electrons in the hydrogen atom are in the ground state. d. Stars of this temperature are too cool to produce an absorption spectrum. e. Stars of this temperature are too hot to produce an absorption spectrum.
A charge of 4.0 nC is distributed uniformly along the x axis from x = +4 m to x = +6 m. Which of the following integrals is correct for the electric potential (relative to zero at infinity) at the origin?
A.
B.
C.
D.
E.
The deflection of one lithospheric plate beneath another plate with which it is colliding is called
a. subduction. b. superposition. c. cross-cutting. d. plutonic movement.
In western movies you often see a person putting his ear against the rails in the train tracks to find out if a train is approaching. Why would this give him advance knowledge of the approach of a train?
What will be an ideal response?