Thermal-electric solar power stations typically experience fluctuations in available sunlight throughout the day, but can use ________ to smooth out electrical power levels to their customers.
What will be an ideal response?
phase-change materials
phase-changing materials
PCMs
PCM
batteries
capacitors
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Because almost all galaxies show redshifted spectra, we know that
A) the sky must be dark at night. B) the universe is expanding. C) our understanding of redshift is wrong. D) we must be at the center of the universe. E) the universe is closed.
At what rate is thermal energy generated in the 30-? resistor?
a.
20 W
b.
27 W
c.
60 W
d.
13 W
e.
30 W
Ekapluto is an unknown planet that has two moons in circular orbits. The table summarizes the hypothetical data about the moons. (G = 6.67 × 10-11 N ? m2/kg2)
Mass Radius Orbital radius Orbital period Moon A 4.0 × 1020 kg 2.0 × 108 m 4.0 × 106 s Moon B 1.5 × 1020 kg 2.0 × 105 m 3.0 × 108 m The mass of Ekapluto is closest to A) 1.0 × 1022 kg. B) 3.0 × 1022 kg. C) 1.0 × 1023 kg. D) 3.0 × 1023 kg. E) 1.0 × 1024 kg.
The force that causes Earth to orbit the Sun is due to gravity, while the force needed to keep Earth moving as it circles the Sun is
A) inertia. B) due to gravity. C) due to both inertia and gravity. D) no force at all.