Wave 1 has amplitude of 9.0 units and wave 2 has amplitude 4.0 units. What is the ratio of their intensities, I1/I2?
A. 20
B. 5.1
C. 2.3
D. 1.5
E. 1.3
B. 5.1
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Velocity: A runner ran the marathon (approximately 42.0 km) in 2 hours and 57 min. What was the average speed of the runner in m/s?
A. 14,200 m/s B. 124 m/s C. 3.95 m/s D. 14.2 m/s
Approximately how many other planetary systems have been discovered to date?
A) tens B) hundreds C) thousands D) tens of thousands E) millions
A 60.0-kg mass person wishes to push a 120-kg mass box across a level floor. The coefficient of static friction between the person's shoes and the floor is 0.700
What is the maximum coefficient of static friction between the box and the floor such that the person can push horizontally on the box and cause it to start moving? A) 0.333 B) 0.500 C) 0.350 D) 0.667 E) 0.700
Which of the following isotopes is radioactive?
A) Carbon-12 B) Carbon-14 C) both of these D) neither of these