A red shirt is red because it
A) reflects red light but absorbs other colors.
B) transmits red light.
C) emits red light only.
D) absorbs red light but reflects other colors.
A) reflects red light but absorbs other colors.
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Mass and Weight: An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?
A. 16 N B. 61 N C. 99 N D. 600 N E. 440 N
______ is another term for podcast.
A. radiocast B. audiocast C. webcast D. showcast
It sure is bright everywhere; you've been able to travel around a bit, and it's clear that you are not in a star. Yet it is as bright as looking directly at the Sun
In your extensive travels through your current surroundings, you cannot find a single neutral atom anywhere, nor can you find a nucleus besides hydrogen or helium. And, while it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the universe during its first 300,000 years. B) You are in the universe more than 10100 years in the future. C) You are in an accretion disk around a supermassive black hole. D) You are in the central regions of a quasar. E) You are where the Sun should be located, but about 5 billion years from now.
Most of the energy during the collapse of the iron core of a supergiant star is released in the form of neutrinos—nearly massless subatomic particles that rarely interact with matter. So how is it they can blow away a stars outer shells?
A) Although they rarely interact with matter, the sheer number released during the collapse is enough to move most of the star's mass into surrounding space at incredibly high rates of speed. B) By creating a massive magnetic field that convulses in on itself, ripping away the stars outer shells C) When neutrinos exceed a certain speed, 22,300 km/s, they interact with matter quite effectively. D) By developing a temporary, but relatively strong positive charge