When an object is 12 cm in front of a concave spherical mirror, the image is formed 3.0 cm in front of the mirror. What is the focal length of the mirror?
A) 15 cm
B) 4.0 cm
C) 2.4 cm
D) 1.3 cm
C
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A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is
a. 0 b. 2 m/s2. c. 4 m/s2. d. 5 m/s2. e. 7.5 m/s2.
A seed is 15 mm in front of a converging lens, and the image of the seed is 4.0 mm behind the lens. What is the focal length of the lens?
A) 11 mm B) 5.5 mm C) 3.8 mm D) 3.2 mm
Earth's internal layers were discovered by studying the movement of P- and S- waves through Earth's interior. In comparison to S-waves, the movement of P-waves is
A) fast, compressing and expanding the rock as they move through it. B) fast, vibrating the rock particles up and down and side-to-side. C) slower and can travel through solid granite, magma, water or air. D) slower and can travel only through solids, not liquids.
What causes the sun to "bob" up-and-down in its orbit around the galactic center?
A) gravitational attraction towards other nearby galaxies B) the localized pull of stars within the disk itself C) lack of friction with the low-density interstellar medium D) A and B E) B and C