Simple Harmonic Motion: If a pendulum makes 12 complete swings in 8.0 s, what are its (a) frequency and (b) period?
What will be an ideal response?
(a) 1.5 Hz (b) 0.67 s
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The figure shows the graph of 
versus time for an object moving along the x-axis. What is the acceleration at t = 7.0 s?
A. 4.0 
B. 5.0
C. 0.5
D. 0.4
Determine the rate of radiant heat emission in watts per square meter from a blackbody at (a) 150°C, (b) 600°C, (c) 5700°C.
GIVEN • A blackbody FIND The rate of radiant heat emission (qr) in W/m2 for a temperature of (a) T = 150°C = 423 K (b) T = 600°C = 873 K (c) T = 5700°C = 5973 K PROPERTIES AND CONSTANTS The Stefan-Boltzmann constant (?) = 5.67 ? 10–8 W/(m2 K4)
The Oort Cloud is thought to be
A) the cloud of gas and dust from which our solar system formed. B) a cloud of debris that occasionally encounters the Earth, causing a meteor shower. C) the spherical cloud of comets and some larger icy bodies surrounding the outer solar system. D) a cloud of asteroids moving between the orbits of Mars and Jupiter. E) the material in the ecliptic plane that creates the zodiacal light.
In Europe, the combined Mississippian and Pennsylvanian periods are known as the
a. Carboniferous. b. Devonian. c. Pliocene. d. Tertiary.