The infinite, open universe has a geometry compared to the surface of a(n) ________
Fill in the blank(s) with correct word
saddle
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An atom can get the energy that moves an electron to a higher energy level by:
A) absorbing a photon of electromagnetic radiation. B) preventing collisions with other atoms. C) moving the electron to a tightly bound level. D) transferring the electron to the ground state.
Acceleration: A car is traveling north at 17.7 m/s. After 12 s its velocity is 14.1 m/s in the same direction. Find the magnitude and direction of the car's average acceleration.
A. 0.30 m/s2, south B. 2.7 m/s2, south C. 0.30 m/s2, north D. 2.7 m/s2, north
What causes the change of the constellations with the seasons?
A. the cycle of lunar phases B. This is merely an illusion caused as the length of the day changes. C. It is caused as the constellations move amongst themselves. D. It is caused by Earth's motion around the Sun.
The leading explanation for the existence of spiral arms are:
A) shock waves from cyclic supernovae explosions. B) shock wave from the quasar-like eruption of the galactic core. C) passages of spiral density waves through the interstellar medium. D) passages of massive globular clusters through the galactic plane. E) tidal streams of small galaxies being torn up by our monster Galaxy.