The most recent evidence from the use of Type Ia supernovae as standard candles says that
a) the universe is decelerating
b) the universe is accelerating
c) the universe is closed
d) the cosmological constant is zero
e) the universe is stationary
Ans: b) the universe is accelerating
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Intensity of Sound: A certain factory whistle can be heard up to a distance of 2.5 km. Assuming that the acoustic output of the whistle is uniform in all directions, how much acoustic power is emitted by the whistle? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 0.079 mW B. 0.026 mW C. 0.26 mW D. 0.79 mW E. 2.6 mW
The current through a 50-? resistor is I = (0.80
A) sin(240t), where t is measured in seconds. What is the rms current? A) 0.57 A B) 0.80 A C) 1.1 A D) 1.6 A
The Cassini Division is a gap in Saturn's rings caused by
A) Saturn's magnetic field. B) two shepherding moons. C) Saturn's excess heat. D) gravitational interaction with Mimas. E) the icy ring particles melting.
The maximum value of the electric field in an electromagnetic wave is 2.0 V/m. What is the maximum value of the magnetic field in that wave? (c = 3.0 × 108 m/s)
A) 6.7 pT B) 6.7 mT C) 6.7 nT D) 6.7 ?T E) 6.7 T