How many revolutions per second are needed for a centrifuge to produce an acceleration of 1200g at a radius arm of 15.0 cm?
a. 40.7 rev/s
c. 81.4 rev/s
b. 44.6 rev/s
d. 151 rev/s
B
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Which of the following describes what will happen to a light ray incident on a glass-to-air boundary at greater than the critical angle?
a. total reflection b. total transmission c. partial reflection, partial transmission d. partial reflection, total transmission
A wire (length = 2.0 m, diameter = 1.0 mm) has a resistance of 0.45W. What is the resistivity of the material used to make the wire?
a. 5.6 × 10^-7 W × m b. 1.2 × 10^-7 W × m c. 1.8 × 10^-7 W × m d. 2.3 × 10^-7 W × m e. 7.1 × 10^-7 W × m
What is the probability that an object 100 meters in diameter will hit Earth during the coming year?
A. about 1 in 2 B. about 1 in 10 C. about 1 in 1000 D. about 1 in 100 million E. zero
Which of these objects is moving with constant velocity but changing acceleration?
a. a rock dropped from a bridge b. a car going around a banked curve at 40 m/s c. an aircraft being launched off of an aircraft carrier d. an aircraft in a banked turn at 100 m/s