Who started launching liquid-filled rockets in the United States in 1926?
A) Robert Goddard
B) Konstantin Tsiolkovsky
C) Hermann Oberth
D) Wernher von Braun
A
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Newton's Second Law in 1 Dimension: A block is on a frictionless table, on earth. The block accelerates at 3.0 m/s2 when a 20 N horizontal force is applied to it. The block and table are set up on the Moon where the acceleration due to gravity is 1.62 m/s2. The weight of the block on the Moon is closest to
A. 11 N. B. 9.5 N. C. 8.1 N. D. 6.8 N. E. 5.5 N.
Which of the following describes the light reflecting and transmission characteristics of a mineral?
fluorescence luster virtual absorption color streak
If an electron is accelerated from rest through a potential difference of 9.9 kV, what is its resulting speed? (e = 1.60 × 10-19 C, k = 1/4??0 = 8.99 × 109 N • m2/C2, mel = 9.11 × 10-31 kg)
A) 5.9 × 107 m/s B) 4.9 × 107 m/s C) 3.9 × 107 m/s D) 2.9 × 107 m/s
Of the three types of nuclear decay, only __________ does not affect the atomic number of the nucleus
Fill in the blank(s) with correct word