As a supersonic airplane increases its speed more and more, the half-angle of the conical shock wave
A) decreases. B) increases. C) is not affected.
A
You might also like to view...
Vector A has a magnitude of 3.0 units and makes an angle of -90.0
with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
with the positive x-axis. What is the direction of the vector sum of A + B referenced to the positive x-axis?
A. -107
B. 55
C. -55
D. -145
Which of the following is not evidence for plate tectonics on Earth?
A) Some continental boundaries fit together like pieces of a jigsaw puzzle. B) Similar rocks and fossils are found in different continents. C) high ocean ridges between the continents D) the existence of volcanoes E) earthquakes
When material expanding away from a star in a binary system leaves a star's Roche lobe,
a. the material will start to fall back toward the star. b. all of the material will accrete on to the companion. c. the material is no longer gravitationally bound to that star. d. the material will increase in temperature an eventually undergo thermonuclear fusion. e. c and d.
The Drake equation now tells us that the number of technological civilizations in our Galaxy at this time is:
A) only our own. B) five to ten at most. C) perhaps 3,000. D) millions. E) not known; insufficient data to compute.