Which of the following would lead to a warmer temperature for a planet?
A) a decrease in the planet's reflectivity
B) a decrease in the planet's amount of greenhouse gases
C) a decrease in the brightness of the Sun
D) a decrease in the number of volcanic eruptions on the planet
A) a decrease in the planet's reflectivity
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The scale of apparent visual magnitudes extends into negative numbers to represent the faintest objects in the sky
a. True b. False Indicate whether the statement is true or false
The force on a charged object divided by the charge on the object is
a. voltage. b. current. c. resistance. d. electric field. e. critical temperature.
A mass of 4.0 kg, resting on a horizontal, frictionless surface, is attached on the right to a horizontal spring with spring constant 30 N/m and on the left to a horizontal spring with spring constant 50 N/m. If this system is moved from equilibrium, what is the effective spring constant?
a. 16 N/m c. 20 N/m b. 80 N/m d. -20 N/m
A circular conducting loop lies in the xy plane of a certain reference frame. We are looking down on the loop with the +z axis pointing up at us, what kind of field actually pushes charge carriers around the loop (if current flows in the loop at all)?
A. The changing magnetic field. B. An electric field. C. No current flows in the loop.