The Moon completes one orbit around Earth about every
a. 29.5 days.
b. 7 days.
c. 365 days.
d. sidereal day.
a
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The Chandra X-Ray Observatory must operate in space because
A) X-rays are too dangerous to be allowed on the ground. B) X-rays do not penetrate Earth's atmosphere. C) X-ray telescopes require the use of grazing incidence mirrors. D) It was built by NASA.
The superposition of two waves
?
and
?
at the location x = 0 in space results in
A. beats at a beat frequency of 3 Hz. B. a pure tone at a frequency of 153 Hz. C. a pure tone at a frequency of 156 Hz. D. beats at a beat frequency of 6 Hz. E. beats at a frequency of 156 Hz.
A rocket moving in outer space maintains a constant acceleration (magnitude = 20 m/s2) while ejecting fuel at a speed of 15 km/s relative to the rocket. If the initial mass of the rocket is 3 000 kg, what is the magnitude of the thrust after 800 kg of fuel have been consumed?
a. 56 kN b. 48 kN c. 52 kN d. 44 kN e. 36 kN
The velocity of a particle moving along the x axis is given for t> 0 by vx = (32.0t? 2.00t3) m/s, where t is in s. What is the acceleration of the particle when (after t = 0) it achieves its maximum displacement in the positive x direction?
A. ?64.0 m/s2 B. zero C. 128 m/s2 D. 32.0 m/s2 E. ?32.0 m/s2