A test rocket at ground level is fired straight up from rest with a net upward acceleration of 20 m/s2. After 4.0 s, the motor turns off but the rocket continues to coast upward with insignificant air resistance
What maximum elevation does the rocket reach? A) 160 m
B) 330 m
C) 320 m
D) 410 m
E) 490 m
E
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How is Pluto now classified by astronomers?
A. as a planet B. as a comet C. as a dwarf planet D. as a star E. as an asteroid
Suppose Einstein had never lived and did not publish the special theory of relativity in 1905. According to most historians of science, when would someone else have discovered the theory?
A) within a year B) in about 10 to 20 years C) in about 50 years D) We still wouldn't know about it today. E) If Einstein hadn't lived, space and time would be very different, and the theory would have been discovered by the ancient Greeks.
The quantum mechanical model of the hydrogen atom requires that if the principal quantum number = 4, there will be how many permitted orbital quantum numbers?
a. 2 b. 4 c. 8 d. 16 e. 32
Two blocks are arranged as shown and released from rest
The tension in the string is closest to: