Given how many times intelligent civilizations could have appeared over the universe's history, it is most likely that if other civilizations exist, they will
A) be slightly less advanced than us
B) be much less advanced than us
C) have about the same level of technology as us
D) be much more advanced than us
D
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A baseball is hit almost straight up into the air with a speed of about 20 m s.
(a) How high does it go? (b) How long is it in the air?
A sinusoidal electromagnetic wave in vacuum delivers energy at an average rate of 5.00 µW/m2. What are the amplitudes of the electric and magnetic fields of this wave? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2)
What will be an ideal response?
An ac series circuit has an impedance of 60 ? and a resistance of 30 ?. What is the power factor of this circuit?
A) 1.4 B) 0.50 C) 1.0 D) 0.71
A mirror has a focal length -20 cm. If an object is placed 10 cm in front of the mirror, where will the image form?
A. 20 cm in front of the mirror B. 20 cm behind the mirror C. 6.7 in from of the mirror D. 6.7 behind the mirror E. no image will form