Contrast the deaths of low- versus high-mass stars
What will be an ideal response?
Low-mass stars swell up as red giants, stabilize with the helium flash, then again evolve into supergiants, shedding planetary nebula and leaving the white dwarf core exposed. By contrast, massive stars may form supergiants and continue fusing heavier and heavier elements up to iron, then end in much more violent deaths as Type II supernovae.
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What is aerobraking?
A) the technique of using a planetary atmosphere to change the orbit of a spacecraft B) the use of a planetary atmosphere to redirect a spacecraft to another planet C) the controlled landing of a spacecraft on a planetary surface D) the gradual decrease of speed as a spacecraft leaves the solar system E) the destruction of a spacecraft by the intense pressure as it descends into the atmosphere
If you think of a battery as an electric charge "pump," the battery voltage is analogous to __________
Fill in the blank(s) with correct word
An emf of 0.52 V is induced in a 0.71-H inductor. What is the rate of change of current through the inductor?
a. 0.73 A/s b. 1.4 A/s c. 0.37 A/s d. 1.23 A/s e. 0.71 A/s
A charge of 50-?C is placed on the y axis at y = 3.0 cm and a 77-?C charge is placed on the x axis at x = 4.0 cm. If both charges are held fixed, what is the magnitude of the initial acceleration of an electron released from rest at the origin?
a. 1.2 × 10^20 m/s2 b. 1.5 × 10^20 m/s2 c. 1.0 × 10^20 m/s2 d. 1.8 × 10^20 m/s2 e. 2.0 × 10^20 m/s2