Uniform Circular Motion: A 20-g bead is attached to a light 120 cm-long string as shown in the figure. If the angle ? is measured to be 18°, what is the speed of the mass?
A. 0.55 m/s
B. 2.0 m/s
C. 3.8 m/s
D. 1.3 m/s
E. 1.1 m/s
Answer: E
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About what fraction of Earth’s atmosphere is CO2?
A. 90% B. 1% C. less than 0.1%
Equation of Traveling Waves: Find the speed of an ocean wave whose displacement is given by the equation y = 3.7 cos(2.2x - 5.6t) where x and y are in meters and t is in seconds.
A. 2.5 m/s B. 1.9 m/s C. 3.5 m/s D. 4.5 m/s
In the absence of the greenhouse effect, the water on the surface of Earth would
a. escape into outer space. b. remain in liquid form. c. vaporize and form clouds in the atmosphere. d. freeze. e. be absorbed into rocks.
A resistor and a capacitor are connected in series across an ideal battery having a constant voltage across its terminals. At the moment contact is made with the battery
(a) the voltage across the capacitor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero. (b) the voltage across the resistor is A. equal to the battery's terminal voltage. B) less than the battery's terminal voltage, but greater than zero. C) equal to the battery's terminal voltage. D) zero.