The nucleus of a comet is typically
A) a few hundred kilometers across, and bright, shiny white from its ices.
B) a few meters in diameter.
C) located between the orbits of Mars and Jupiter.
D) a few kilometers in size, and very low in density.
E) very durable, made of iron.
D
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In a neutron star, the protons and electrons are fused together, leaving only neutrons
Indicate whether the statement is true or false
A transformer is used to step up the voltage to a power line. If the stepped-up voltage is 10 times the original value, by how much will the power loss in the line decrease?
a. more than 95% b. between 10% and 20% c. between 20% and 95% d. There will be no change since the power into a transformer equals the power out.
A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m
Which of these observations helped test the idea that Mars' atmosphere thinned due to interactions with the solar wind?
A) The MAVEN orbiter measured present-day gas loss from Mars' atmosphere. B) The Curiosity rover measured the carbon content of rocks on Mars' surface. C) Astronomers used spectrographs on the Keck telescope to measure the density of Mars' atmosphere. D) Geologists measured the carbon content of Martian rocks that were transported to Earth by asteroid impacts.