If a 20-kg object dropped in air has a terminal speed of 60 m/s, what was its acceleration at 30 m/s?
a. 9.80 m/s2
b. 7.35 m/s2
c. 4.90 m/s2
d. 2.45 m/s2
e. More information is needed to answer this question.
b
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Light-gathering power is proportional to the _______________ of the telescope primary lens or mirror
Fill in the blank(s) with correct word
You would like to know the chemical composition of a star's atmosphere. Therefore you will need to obtain the star's ______________ spectra
Fill in the blank(s) with correct word
A 450 g baseball is pitched, reaching the batter with a speed of 37 m/s and is hit such that it returns on the same line at 48 m/s. If the ball was in contact with the bat for 0.22 seconds, what was the average net force experienced by the ball during the time of contact?
A. 170 N B. 98 N C. 77 N D. 18 N
Which of the following is most likely to encourage nuclear weapons proliferation?
A) mining of uranium B) mass production of frozen pizza. C) recycling of plutonium D) fabrication [i.e., production] of reactor fuels pellets and fuel rods E) storage of used nuclear fuel rods