Given that white dwarf supernovae are such good standard candles, why don't we use them to measure the distance to all galaxies?
A) They are rare events, so we have observed them in only a tiny fraction of all galaxies.
B) We cannot see them beyond a distance of about 100 million light-years.
C) They can occur only in spiral galaxies, not elliptical galaxies.
D) We would, but we don't have enough telescopes.
A) They are rare events, so we have observed them in only a tiny fraction of all galaxies.
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Radiative energy is ________
A) energy from nuclear power plants B) heat energy C) energy of motion D) energy carried by light
A long solenoid (n = 1500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V
As viewed from underwater, at what angle from the vertical does the Sun appear to set?
A) 0° B) 90° C) 49° D) 41° E) 45°
Most terrestrial planets have portions of their surface that appear to be significantly older than other portions of their surface. What evidence suggests that the surface of Venus is all of the same age?
a. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age. b. The craters on Venus are randomly distributed in size and number across the surface. c. The volcanoes on Venus are not found in isolated groups, but are scattered around the planet. d. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface. e. Photos taken by probes that landed on Venus showed that all of the rocks were of the same age, all of the rocks were of the same age and the craters on Venus are randomly distributed in size and number across the surface, and the volcanoes on Venus are not found in isolated groups, but are scattered around the planet.