An object is 80 cm in front of a lens. An image forms 10 cm behind the lens. The lateral magnification
A)
is -8.
B)
is -0.125.
C)
is 8.
D)
is 0.125.
E)
cannot be determined with the information given.
B
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When did the objects that we now see as asteroids and comets form in the solar system?
a. Before the cloud flattened into a disk. b. After the cloud flattened into a disk but before solid particles condensed from the gas. c. After solid particles condensed from the gas but before the planets finished forming. d. After the planets finished forming.
In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV b. 17.43 eV c. 38.23 eV d. 3.370 eV e. 1.685 eV
A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 rad/sec2 acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the tangential velocity of a point 4.0 cm from the center at the time 10.0 seconds from the start?
A. 0.50 rad/s B. 0.40 rad/s C. 0.30 rad/s D. 0.20 rad/s E. 0.10 rad/s
The great contribution of Tycho Brahe was to ________
A) offer the first detailed model of a Sun-centered solar system, thereby beginning the process of overturning the Earth-centered model of the Greeks B) observe planetary positions with sufficient accuracy so that Kepler could later use the data to discover the laws of planetary motion C) discover four moons orbiting Jupiter, thereby lending strong support to the idea that the Earth is not the center of the universe D) discover that planets orbit the Sun in elliptical orbits with varying speed