A 2.0 mm diameter wire of length 20 m has a resistance of 0.25 ?. What is the resistivity of the wire?
A) 0.25 ? ? m
B) 5.0 × 10-7 ? ? m
C) 3.9 × 10-8 ? ? m
D) 4.0 × 10-7 ? ? m
E) 16 × 10-8 ? ? m
C
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A catapult is tested by Roman legionnaires. They tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): Range = 0.20 km; angle of launch = ?/4; landing height = launch height
What is the initial velocity of launch of the boulders if air resistance is negligible? A) 44 m/s B) 1.4 m/s C) 22 m/s D) 0.69 m/s
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling towards the factory at 30 m/s? The speed of sound in air is 343 m/s
A) 83 Hz B) 85 Hz C) 87 Hz D) 89 Hz E) 91 Hz
In the context of studying major bodies of our solar system, what category of object does our Moon best fit?
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