An object undergoes uniform circular motion. Which pair of vectors is perpendicular?
A. All three vectors are mutually perpendicular: centripetal acceleration, centripetal force, and velocity
B. Its centripetal acceleration and velocity vectors
C. Its centripetal acceleration and the centripetal force
Answer: B
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When boarding an airplane you bring a bag of chips. While in flight the bag puffs up, because
A) air pressure in the air-tight bag is greater than cabin air pressure. B) suction is occurring. C) air pressure is affected by the Bernoulli principle. D) all the above E) none of the above
Contrast the densities of the terrestrial and Jovian planets
What will be an ideal response?
A ball rolls over the edge of a table with a horizontal velocity v m/s. The height of the table is 1.6 m and the horizontal range of the ball from the base of the table is 20 m
What is the horizontal velocity of the ball just before it touches the ground? A) 35 m/s B) 9.8 m/s C) 20 m/s D) 4.9 m/s E) 70 m/s
A certain factory whistle can be heard up to a distance of 9.8 km
Assuming that the acoustic output of the whistle is uniform in all directions, at what distance from the factory is the intensity level of the whistle sound equal to 25 dB? The threshold of human hearing is 1.0 × 10-12 W/m2. A) 550 m B) 660 m C) 830 m D) 940 m E) 1,100 m