What do we mean by a mass extinction?
A) the extinction of large animals, such as dinosaurs
B) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time
C) an extinction caused by the impact of an asteroid or comet
D) the extinction of any species of plant or animal that has mass
B
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The position of an object that is oscillating on a spring is given by the equation x = (18.3 cm) cos[(2.35 s-1)t]. What are the (a) frequency, (b) amplitude, and (c) period of this motion?
What will be an ideal response?
The Higgs field, if it is discovered, is expected to interact
A) with every type of particle. B) only with particles that have rest mass. C) only with particles that are electrically charged. D) only with particles that have no rest mass. E) only with particles that are not electrically charged.
A 2.00 m by 3.00 m plate of aluminum has a mass of 324 kg. What is the thickness of the plate? (The density of aluminum is 2.70 × 10^3 kg/m3.)
Spherical Mirrors: A person's face is 30 cm in front of a concave spherical shaving mirror. If the image is an erect image that is 1.5 times as large as the object, what is the focal length mirror?
A. 20 cm B. 50 cm C. 70 cm D. 90 cm