A(n) ____________________ is a cool, dense cloud of dust and gas that is undergoing gravitational contraction
Fill in the blank(s) with correct word
protostar
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A total of 2.0 × 1013 electrons pass a given point in a wire in 15 s. What is the current through the wire? (e = 1.60 × 10-19 C)
A) 1.3 mA B) 1.3 A C) 0.21 ?A D) 3.2 ?A
Camera Exposure: A camera lens has a focal length of 50.0 mm and an aperture setting of f/4.00. What is the diameter of the aperture of this lens?
A. 12.5 mm B. 10.1 mm C. 25.0 mm D. 35.4 mm E. 200 mm
Sometime within the next million years or so, their planet is likely to be doomed because
A) jets of material shot out of the accretion disk will shoot down their planet. B) their planet receives most of its energy from the red giant. However, this star will soon be completely devoured in the accretion disk and thus will no longer exist. C) the red giant will probably undergo a supernova explosion within the next million years. D) tidal forces from the black hole will rip the planet apart. E) the planet's orbit gradually will decay as it is sucked in by the black hole.
If you move twice as far away from a lawn mower running in an open field, the amplitude of the sound you hear will be ___________ what it was before
a. the same as b. twice c. half d. four times e. one fourth