Free Fall: A ball is thrown straight up with a speed of 36 m/s. How long does it take to return to its starting point, assuming negligible air resistance?
A. 3.7 s
B. 7.3 s
C. 11 s
D. 15 s
Answer: B
Physics & Space Science
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a. 1° b. 5° c. 13° d. 27.3° e. 29.5°
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What do we mean by the critical density of the universe?
What will be an ideal response?
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The most noteworthy highlight of the Cenozoic era was the
A) break-up of Pangaea. B) emergence of humans. C) Pleistocene extinction. D) ice age.
Physics & Space Science
What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity
Physics & Space Science