This graph shows a light curve for a star. What can you conclude from this graph?
A) The star periodically dims and brightens, with a brightness peak about once a year.
B) The star is orbited by a large planet.
C) The star is about 100 times as bright as the Sun.
D) The star is moving alternately toward and away from us.
A) The star periodically dims and brightens, with a brightness peak about once a year.
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Three identical resistors are connected in parallel to a 12-V battery. What is the voltage of any one of the resistors?
A) 36 V B) 24 V C) 12 V D) 4 V E) zero
The SAE J-1930 standardized name for the sensor that measures the temperature of the air being drawn into the engine is called a(an) ________.
A. Air temperature sensor (ATS) B. Air charge temperature (ACT) sensor C. Manifold air temperature (MAT) sensor D. Intake air temperature sensor (IAT)
The brightest main-sequence star in a cluster has a surface temperature of 10,000 K and a luminosity of about 10 LSun. Referring to the figure above as needed, what is the approximate age of the cluster?
A) 107 years B) 109 years C) 1011 years D) 1013 years
A ball is tied to the end of a cable of negligible mass. The ball is spun in a circle with a radius 2.00 m making 7.00 revolutions every 10.0 seconds. What is the magnitude of the acceleration of the ball?
A) 38.7 m/s2 B) 74.2 m/s2 C) 29.3 m/s2 D) 67.9 m/s2 E) 14.8 m/s2