David stands 2.5 m in front of a plane mirror
(a) How far from David is his image in the mirror?
(b) If David moves away from the mirror at 1.5 m/s, how fast are David and his image moving apart from each other?
(c) If David is 180 cm tall, how tall is his image in the mirror?
(a) 5.0 cm (b) 3.0 m/s (c) 180 cm
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Ancient astronomers thought the heavens were perfect circles, spheres, and unblemished
a. True b. False Indicate whether the statement is true or false
A 10.0 kg mass is attached to the end of a 2.00 m brass rod with a 1.00 mm diameter. If the tensile modulus of brass is 
then the period of the simple harmonic motion of the mass is
A. 0.175 sec. B. 0.105 sec. C. 0.133 sec. D. 0.145 sec. E. 0.167 sec.
According to the principle of equivalence, acceleration is equivalent to
A) velocity. B) net force. C) gravity. D) the state of free-fall. E) energy.
The amount of neutrinos measured from Earth were __________
Fill in the blank(s) with the appropriate word(s).