Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?
A. 9.8 m/s2
B. –9.8 m/s2
C. 0 < 
< 9.8 m/s2
D. 0
E. Other (specify)
A. 9.8 m/s2
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A. accelerate. B. move at constant velocity with respect to an inertial frame. C. oscillate. D. are stationary, but not in moving frames.
Disease frequency is usually expressed as prevalence rate.
a. true b. false
Whose geocentric model of the Universe dominated astronomy for 2,000 years?
a. Kepler b. Copernicus c. Aristotle d. Galileo e. Ptolemy
Which of the following best describes the image of a convex mirror when the object's distance from the mirror is less than the absolute value of the focal point distance?
a. real, inverted, and magnification greater than one b. virtual, upright, and magnification greater than one c. real, inverted, and magnification less than one d. virtual, upright, and magnification less than one