An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 m straight down in 1 s. On this planet, how much does the rock weigh?
A) 1 N
B) 4 N
C) 5 N
D) more than 5 N
B
Environmental & Atmospheric Sciences
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Sound interference with a pair of radio loudspeakers can be nicely demonstrated when the
A. radio signal is monaural for each. B. speakers are brought face to face. C. input and output of the speakers are reversed. D. all of the above
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The Green Revolution is so named because it is environmentally sustainable
Indicate whether this statement is true or false
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Which soil horizon contains humus?
a. A b. B c. C d. D e. O
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