You are given three radioactive samples (?, ?, and ?) and can only dispose of one. The other two you must keep, one in your hand, the other in your pocket. How would you minimize your exposure risk?
A) keep ? in hand, keep ? in pocket, and dispose of ?
B) dispose of ?, keep ? in hand, and keep ? in pocket
C) dispose of ?, keep ? in pocket and keep ? in hand
D) keep ? in pocket, dispose of ?, and keep ? in hand
E) keep ? in hand, dispose of ?, and keep ? in pocket
Answer: A
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What is the frequency (in Hz) of a wave whose displacement is given y = 0.5 sin(0.20x + 120t), where x and y are in cm and t in seconds?
A) 0.5 Hz B) 19. Hz C) 120 Hz D) 10 Hz E) 0.120 kHz
Entropy: When water at 0°C freezes, the entropy of the water
A. increases. B. decreases. C. remains constant. D. could either increase or decrease; it depends on other factors.
List the following events in the order in which they occurred, from first to last.
a) earliest humans b) earliest animals c) impact causes extinction of dinosaurs d) earliest mammals e) earliest plants living on land f) first time there is significant oxygen in Earth's atmosphere g) first life on Earth
Two asteroids have identical masses. However, one asteroid is twice as far from the Sun than the other. According to Newton's Universal Law of Gravitation the force of gravity exerted by the Sun on the more distant asteroid is
A) the same size as the force exerted on the closer asteroid B) one-quarter of the size of the force exerted on the closer asteroid C) twice as large as the force exerted on the closer asteroid D) one-half of the size of the force exerted on the closer asteroid