Which four moons of the jovian planets show the most promise of life?
A) Io, Ganymede, Callisto, Europa
B) Titan, Enceladus, Dione, Mimas
C) Miranda, Titania, Ariel, Oberon
D) Enceladus, Europa, Ganymede, Titan
E) Ganymede, Titan, Miranda, Enceladus
D
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A 20-ton truck collides with a 1500-lb car and causes a lot of damage to the car. During the collision
A) the force on the truck due to the collision is slightly greater than the force on the car. B) the force of on the truck due to the collision is exactly equal to the force on the car. C) the force on the car due to the collision is much greater than the force on the truck. D) the car and the truck have the same magnitude acceleration.
Which of the following statements about parallax is not true?
A) The existence of stellar parallax is direct proof that Earth orbits the Sun. B) You can demonstrate parallax simply by holding up a finger and looking at it alternately from your left and right eyes. C) Ancient astronomers were unable to measure parallax and used the absence of observed parallax as an argument in favor of an Earth-centered universe. D) Measurement of stellar parallax allows us to determine distances to nearby stars. E) The technique of stellar parallax was used by Hubble to determine that the Andromeda Galaxy (M 31 ) is about 2 million light-years away.
Carly places one end of a steel bar in a Bunsen flame and the other end in an ice cube. By what factor is the rate of heat flow changed when the bar's cross-sectional area is tripled?
a. 0.33 c. 3.0 b. 1/9 d. 9.0
How do x-ray measurements help us measure the amount of dark matter in galaxy clusters?
A) The gravity of dark matter causes intracluster gas to be heated to very high temperatures, and the higher the temperature, the stronger the x-ray emission we will detect from the gas. B) Dark matter absorbs x-rays, so we can map the dark matter distribution by looking for absorption lines in x-ray spectra. C) Collisions between dark matter particles emit x-rays, allowing us to map dark matter with x-ray images.