A sonic boom is produced by an airplane flying at a speed
A) just below the speed of sound.
B) equal to the speed of sound.
C) greater than the speed of sound.
D) all of the above
E) none of the above
Answer: C
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_________ are electromagnetic radiation with wavelengths typically from 0.1 nm to 1 nm.
Fill in the blank(s) with the appropriate word(s).
A heavy bus bar is 20. cm long and of rectangular cross-section, 1.0 cm × 2.0 cm. What is the voltage drop along its length when it carries 4000. A? (The resistivity of copper is 1.69 × 10-8 ?-m.)
What will be an ideal response?
A gravitational lens occurs when
A) a massive object causes more distant objects to appear much larger than they should, and we can observe the distant objects with better resolution. B) a telescope lens is distorted by gravity. C) a massive object bends light beams that are passing nearby. D) dark matter builds up in a particular region of space, leading to a very dense region and an extremely high mass-to-light ratio.
Which of the following statements is incorrect?
What will be an ideal response?