Parallel light rays from a distant object strike the surface of a concave mirror. After reflecting from the mirror's surface, the rays will converge at
a. the mirror's focal point
b. a point beyond the mirror's focal point
c. a point nearer than the mirror's focal point
d. none of the above
A
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About when did the extinction of the dinosaurs occur?
A) 3.5 billion years ago B) 2 billion years ago C) 540 million years ago D) 65 million years ago E) less than 1 million years ago
Dust particles are pulverized rock, which has density 2500 kg/m3. They are approximately spheres 20 ?m in diameter
Treating dust as an ideal gas, what is the root-mean-square speed (thermal speed) of a dust particle at 400°C? (The Boltzmann constant is 1.38 × 10-23 J/K.) A) 5.2 × 10-5 m/s B) 1.7 × 10-5 m/s C) 3.0 × 10-5 m/s D) 7.3 × 10-5 m/s
When bringing water to a boil in the mountains, the time needed to reach the boiling point is
A) less than at sea level. B) more than at sea level. C) the same as at sea level.
Two objects of different mass are released simultaneously from the top of a 20-m tower and fall to the ground. If air resistance is negligible, which statement best applies?
a. The greater mass hits the ground first. b. Both objects hit the ground together. c. The smaller mass hits the ground first. d. No conclusion can be made with the information given.