Ultrasound is used
a. to form images of internal organs.
b. by bats to navigate.
c. in automatic focus cameras.
d. to control insects.
e. all of the above
e
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Sounds from musical instruments are produced by
A) vibrating strings. B) vibrating air columns. C) percussion. D) all of the above E) none of the above
A light aircraft that weighs 1,600 N is accelerated at 8 m/s/s for 15 seconds. The work done on the aircraft is _________
Fill in the blank(s) with correct word
The intricate patterns visible in an X-ray image of the Sun generally show ________
A) structure within sunspots B) a bubbling pattern on the photosphere C) helioseismological fluctuations D) extremely hot plasma flowing along magnetic field lines
In which type of collision is the most kinetic energy lost?
A. A perfectly elastic collision B. A perfectly inelastic collision C. A partially inelastic collision D. Kinetic energy is always conserved