A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it approaches a stationary pedestrian
What frequency does the pedestrian hear? The speed of sound in air is 343 m/s.
A)
200 Hz
B)
375 Hz
C)
400 Hz
D)
425 Hz
E)
450 Hz
D
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Based on the observed amount of deuterium in the universe, we can conclude that
A) neutrons outnumber protons 7 to 1 in the universe. B) most of the deuterium that was created during the era of nucleosynthesis has since been destroyed. C) we live in a critical-density universe. D) the density of ordinary (baryonic) matter is about 5 percent of the critical density. E) ordinary (baryonic) matter makes 75 percent of the mass of the universe.
What is meant by stagnation point?
What will be an ideal response?
The Crab Nebula and its pulsar were produced by a ________ supernova
Fill in the blank(s) with correct word
Select the flow which must be classified a viscous flow, a flow in which effects of viscosity cannot be neglected:
(A) Flow through a pipe contraction (B) Flow through a rocket’s nozzle (C) Flow around an airfoil (D) Flow in the entrance region of a pipe