While a rock is falling straight down with negligible air resistance, it has
A) an unchanging speed.
B) an increasing speed.
C) a decreasing speed.
D) zero speed.
E) None of the above.
B
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The human eye is sensitive to light with wavelength down to 710 nm. What is the frequency of radiation at this wavelength? (1 nm = 10?9 m and c = 3.00 × 10^8 m/s)
a. 4.23E+5 Hz b. 4.42E+6 Hz c. 4.23E+14 Hz d. 4.37E+7 Hz e. 2.18E+7 Hz
What process has played the greatest role in determining the arrangement of the continents on Earth?
A) impact cratering B) volcanism C) plate tectonics D) erosion E) acid rain
Explain the role of convection on the Sun's surface
What will be an ideal response?
A magnifying lens of power d (in diopters) gives what magnification when the viewing eye is relaxed assuming a near point of 25 cm?
a. 25d b. 0.25/d c. d/4 d. The correct answer is not given.