A stunt pilot performs a circular dive of radius 800 m. At the bottom of the dive (point B in the figure) the pilot has a speed of 200 m/s which at that instant is increasing at a rate of 20 m/s2. What acceleration does the pilot have at point B?
?
?
a.
m/s2
b.
c
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A 100-g sample of a certain substance undergoes a transformation of some kind that releases 20,000 J of energy. What kind of transformation is this likely to be?
A. A temperature change B. A phase change C. A chemical reaction D. A nuclear reaction E. It is impossible to guess.
A water bug on the surface of a pond bobs up and down three times per second on ripples with wavelength 10.5 cm. A fish resting at the surface of the pond is 8.50 m from the water bug. How long does it take a ripple passing the water bug to reach the fish?
a. 27.0 s b. 243 s c. 81.0 s d. 0.893 s
The outer core
A) has a plastic-like flow. B) flows fast enough to power Earth's magnetic field. C) is solid as a rock. D) transmits S-waves.
Starburst galaxies are best observed in which wavelength range?
A) x-rays B) ultraviolet C) visible D) infrared E) gamma rays