On a Hertzsprung-Russell diagram, where would we find red giant stars?
A) upper right
B) lower right
C) upper left
D) lower left
A
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An electrical device that is "grounded" has
A) no potential difference between it and the ground. B) an infinite potential difference between it and the ground. C) a firm connection to the ground. D) low voltage.
What is a major selecting factor for astronomers looking to place a telescope atop a mountain?
a. non-turbulent airflow b. percentage of tree-coverage c. amount of precipitation d. the country it is located within e. the economics of the location
The Atacama Large Millimeter Array achieves exceptional resolution by using exceptionally:
A) large radio antennas in a fixed array. B) large radio antennas in a mobile array. C) many radio antennas in a fixed array. D) many radio antennas in a mobile array. E) many portions of the electromagnetic spectrum.
In a hydraulic garage lift, the small piston has a radius of 5.0 cm and the large piston has a radius of 15 cm
What force must be applied on the small piston in order to lift a car weighing 20,000 N on the large piston? Assume the pistons each have negligible weight. A) 6.7 × 103 N B) 5.0 × 103 N C) 2.9 × 103 N D) 2.2 × 103 N