How does a rocket take off?
A) Its rocket engines push against the launch pad, propelling the rocket upward.
B) It converts mass-energy to kinetic energy.
C) It achieves lift from its wings in the same way that airplanes do.
D) Hot gas shoots out from the back of the rocket and, by conservation of momentum, the rocket moves in the opposite direction.
E) The hot rocket exhaust expands the air beneath the rocket, propelling it forward.
D) Hot gas shoots out from the back of the rocket and, by conservation of momentum, the rocket moves in the opposite direction.
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When a meteor strikes Earth's surface, it is called a(n) ______________
Fill in the blank(s) with correct word
The distance between peaks on a wave divided by the time for the wave to travel this distance is the wave's
a. speed b. frequency c. wavelength d. amplitude e. loudness
Which of the following is NOT an active galaxy?
A. Seyfert galaxies B. QSO's C. radio galaxies D. Attractor voids E. None of these choices is an active galaxy.
Sirius is a star with spectral type A star and Rigel is a star with spectral type B star. What can we conclude?
A) Rigel has a higher core temperature than Sirius. B) Sirius has a higher core temperature than Rigel. C) Rigel has a higher surface temperature than Sirius. D) Sirius has a higher surface temperature than Rigel.