Resolution: The pupil of a person's eye changes from a diameter of 3.5 mm to 1.5 mm as the illumination is increased. By what factor does the minimum angle of resolution change?
A. 0.43
B. 0.65
C. 2.0
D. 2.3
Answer: D
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You have a guitar string tied at both ends. You pluck it and you get as a fundamental frequency an "A" note of 440 Hz. If you wanted to adjust the string to get the next "A" note one octave higher (880 Hz) as a fundamental frequency, what could you do?
1.double the string tension 2.halve the string tension 3.quarter the string tension 4.quadruple the string tension
A person runs up a long flight of stairs in 10 seconds. If the person's weight is 600 N and the vertical height of the stairs is 20 meters, the person's power output is __________
Fill in the blank(s) with correct word
As a car moves forward on a level road at constant velocity, the net force acting on the tires is:
a. greater than the normal force times the coefficient of static friction. b. equal to the normal force times the coefficient of static friction. c. the normal force times the coefficient of kinetic friction. d. zero.
What evidence suggests that small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation. B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older. C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past. D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during an age of starburst activity. E) We do not have any evidence that galaxies in our Local Group were once starburst galaxies.