New telescopes are using "adaptive optics.". What is that?
a. using parabolic instead of spherical mirrors
b. using computer image processing to enhance images
c. building mirrors in hexagonal segments
d. continually adjusting the mirror's shape during observations
D
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The gravitational acceleration on a planet's surface is 16.0 m/s2. What is the gravitational acceleration at an altitude of one planet diameter above the SURFACE of the planet?
A) 5.33 m/s2 B) 1.78 m/s2 C) 1.60 m/s2 D) 4.00 m/s2 E) 8.00 m/s2
For general projectile motion if we neglect air, the vertical component of a projectile's acceleration
A) is always zero. B) remains a non-zero constant. C) continuously increases. D) continuously decreases. E) first decreases and then increases.
The minimum energy needed to produce a positron is
a. 3 MeV b. 2 MeV c. 1 MeV d. 4 MeV e. 0.51 MeV
What's the Big Bang?
a. the creation of the universe b. microwave radiation from all directions in the sky c. the Hubble relation d. a punk rock band