Which of the following is not a piece of evidence supporting the idea that Europa may have a subsurface ocean?
A) Photos of Europa's surface show regions that appear to consist of jumbled icebergs frozen in place.
B) Astronomers have detected small lakes of liquid water on Europa's surface.
C) Europa has a magnetic field that appears to respond to Jupiter's magnetic field.
D) Europa's surface shows very few impact craters.
B
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a. 4.2 ly b. 4.2 years c. 3 × 10^8 m/s d. None of the other choices are correct.
What is the frequency of the wave?
A. 80 Hz
B. 50 Hz
C. 120 Hz
D. 140 Hz
E. 160 Hz
A projectile is projected from the origin with a velocity of 20.0 m/s at an angle of 30.0 degrees above the horizontal. The projectile lands on a roof that is 4.00 m height. What is the speed when the projectile hits the roof?
A. 19.2 m/s B. 17.9 m/s C. 12.5 m/s D. 9.20 m/s E. 8.40 m/s
A 2.0-?F capacitor in series with a 2.0-k? resistor is connected to a 60-Hz AC source. Calculate the impedance of the circuit
a. 1500 ohms b. 1800 ohms c. 2100 ohms d. 2400 ohms e. 8600 ohms