A capacitor with a capacitive reactance of 40.0 ? is connected in series with a 100-? resistor across an ac source of frequency 60.0 Hz. What is the phase angle?
A) +68.2°
B) -68.2°
C) -21.8°
D) +21.8°
E) 90.0°
C
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Which of the following is true of the spiral density wave theory?
A) It explains the formation of stars in self-sustaining star formation regions. B) It establishes that spiral arms are wound up by differential rotation. C) It does not account for the branches and spurs in spiral arms. D) It does not explain the spiral structure of spiral galaxies.
The production of elements heavier than helium by fusion in stars and during supernova explosions is called ______________________
Fill in the blank(s) with correct word
Two steel spheres are made of the same material and have the same diameter, but one is solid and the other is hollow. If their temperature is increased by the same amount,
A) the solid sphere becomes bigger than the hollow one. B) the hollow sphere becomes bigger than the solid one. C) the two spheres remain of equal size. D) the solid sphere becomes heavier and the hollow one becomes lighter. E) the solid sphere becomes lighter and the hollow one becomes heavier.
What is the relationship between density and distance for the four Galilean moons of Jupiter?
A) density increases with increasing distance B) density remains constant with distance C) density first decreases and then increases with distance D) density decreases with distance