Two speakers are emitting coherent sound waves at a frequency of 440 Hz. If the speed of sound is 343 m/s, and it is observed that no sound is heard a distance of 17.2 m from one speaker, which of the following is a possible distance to the second speaker?
A. 14.6 m
B. 17.2 m
C. 19.6 m
D. 18.8 m
E. 16.5 m
F. 18.0 m
A. 14.6 m
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A skydiver has bailed out of his airplane at a height of 3000 m. The mass of the skydiver and his parachute is 80 kg. What is the drag (force of air resistance) when he reaches terminal speed?
A. 120 N B. 360 N C. 784 D. 750 N
What do astronomers mean by light pollution?
A) Light pollution refers to pollution caused by light industry as opposed to heavy industry. B) Light pollution refers to harmful gases emitted by common street lights. C) Light pollution refers to light used for human activities that brightens the sky and hinders astronomical observations. D) Light pollution refers to the lights that must be used inside major observatories and that make it difficult for astronomers' eyes to adapt to darkness. E) Light pollution is another name for sunlight, which makes it impossible to see stars in the daytime.
Distinguish between conduction and convection. Give examples of each
What will be an ideal response?
An aqueous solution of the colorless gas HCl is called ______________
Fill in the blank(s) with correct word