Which list includes only units of the U.S. customary system?
a. kilograms, micrometers, milliseconds
b. pounds, kilometers, nanoseconds
c. grams, feet, minutes
d. pounds, centimeters, seconds
e. ounces, inches, seconds
e
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What is the speed of the rock as it hits the ground?
a. 11.5 m/s b. 26.8 m/s c. 24.5 m/s d. 16.2 m/s
The half-life of 20F is 11 s. What fraction of a sample of 20F will remain after 99 s have elapsed?
a. 1/10 b. 1/9 c. 1/400 d. 1/512 e. None of these
Based on its surface temperature of 5,800 K, what color are most of the photons that leave the Sun's surface?
A) blue B) red C) yellow D) orange E) green
Conservation of angular momentum means that a spinning body tends to:
A) fly apart. B) slow down. C) wobble into an eccentric orbit. D) gravitationally collapse. E) keep spinning.