The most abundant element in the universe is
a. hydrogen.
b. iron.
c. oxygen.
d. carbon.
a
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Intensity of Sound: The intensity level is 65 dB at a distance 5.00 m from a barking dog. What would be a reasonable estimate for the intensity level if two identical dogs very close to each other were barking? You can ignore any interference effects.
A. 65 dB B. 68 dB C. 130 dB D. 136 dB
Transformers: The secondary coil of an ideal neon sign transformer provides 7500 V at 10.0 mA. The primary coil operates on 120 V. What current does the primary draw?
A. 0.625 A B. 0.625 mA C. 0.160 A D. 1.66 A
An optical system comprises in turn, from left to right: an observer, a lens of focal length +30 cm, an erect object 20 mm high, and a convex mirror of radius 80 cm
The object is between the lens and the mirror, 20 cm from the lens and 50 cm from the mirror. The observer views the image that is formed first by reflection and then by refraction. What is the position of the final image, measured from the mirror? A) 90 cm B) 102 cm C) 114 cm D) 126 cm E) 138 cm
An astronaut has landed on Planet N-40 and conducts an experiment to determine the acceleration due to gravity on that planet
She uses a simple pendulum that is 0.640 m long and measures that 10 complete oscillations 26.0 s. What is the acceleration of gravity on Planet N-40? A) 4.85 m/s2 B) 1.66 m/s2 C) 3.74 m/s2 D) 2.39 m/s2 E) 9.81 m/s2