Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz
A person is standing away from the wall, in front of one of the loudspeakers. What is the closest nonzero distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s.
A) 0.34 m
B) 0.73 m
C) 1.2 m
D) 1.6 m
B
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Evidence for the drifting of continents or plate tectonics on Earth is
a. the manner in which the outlines of continents fit together much like puzzle pieces. b. the similarity of rocks found occurring along certain continental coastal areas. c. the long, continuous ridges found in the middle of the Atlantic Ocean. d. all of the other choices.
The belts of Jupiter are best described as follows
A) regions of downward moving material and low pressure. B) regions of upward moving material and low pressure. C) regions of upward moving material and high pressure. D) regions of downward moving material and high pressure. E) turbulent regions with no organized circulation pattern.
An object of mass m moving with a certain speed has a kinetic energy of 0.0124 J. The object collides with a horizontal spring and compresses it by 0.800 m before it is brought to rest. What is the spring constant of this spring?
A) 0.315 N/m B) 0.150 N/m C) 0.194 N/m D) 0.0235 N/m E) 0.0388 N/m
From the edge of a roof top you toss a green ball upwards with initial velocity v0 and a blue ball downwards with the same initial velocity. When they reach the ground below,
A) the green ball will be moving faster than the blue ball. B) the blue ball will be moving faster than the green ball. C) the two balls will have the same speed.