After what evolutionary stage does a star become a white dwarf?
a. protostar
b. pre-main sequence
c. main sequence
d. giant
d
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You are holding your physics book, pushing upwards on it with the palm of your hand. The reaction to this force is the force on __________ by __________
Fill in the blank(s) with correct word
A rocket with an initial mass of 1000 kg adjusts its thrust by varying the rate at which mass is ejected. The ejection speed relative to the rocket is 40 km/s. If the acceleration of the rocket is to have a magnitude of 20 m/s2 at an instant when its mass is 80% of the original mass, at what rate is mass being ejected at that instant? Ignore any external forces on the rocket
a. 0.40 kg/s b. 0.50 kg/s c. 0.60 kg/s d. 0.70 kg/s e. 0.80 kg/s
Refracting Telescope: Cal is viewing the Moon with his new telescope, using a 10-mm focal length eyepiece. For greater detail, he wishes to double the magnification of his telescope. An eyepiece having which one of the following characteristics will accomplish this for him?
A. 40 diopters B. 8 mm C. 12 mm D. 200 diopters E. 5 diopters
You could swallow a capsule of germanium, Ge (atomic number 32), without significant ill effects. If a proton were added to each germanium nucleus, however, you would not want to swallow the capsule because the germanium would
A) become arsenic. B) become radioactive. C) expand and likely lodge in your throat. D) have a change in flavor.