Stars twinkle when seen from Earth. When seen by an astronaut on the Moon, stars
A) twinkle more.
B) twinkle less.
C) don't twinkle.
Answer: C
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The appearance of an aurora indicates that
A. the planet is being bombarded by small meteors. B. there is intelligent life on the planet producing the aurora from below. C. there is a lot of lightning discharges in the planet's atmosphere. D. the planet has a magnetic field.
Describe the temperature change in the transition zone
What will be an ideal response?
Tensile Stress and Strain: As one stretches a metal wire, which condition is reached first?
A. the elastic limit B. the breaking point C. the proportional limit
Energy in Capacitors: Measurements show that it takes 0.30 mJ of work to move 5.0-?C of charge from one plate to another of a certain air-filled capacitor while the potential difference between these plates is kept constant. What is the potential difference between the plates of this capacitor?
A. 60 V B. 81 V C. 55 V D. 23 V E. 0 V