Which statement is correct?
A. Only radial-velocity and transit methods reveal the radius of the planet.
B. Only direct imaging and gravitational lensing methods reveal the mass of the planet.
C. Only radial-velocity and gravitational lensing methods reveal the mass of the planet.
D. Only direct imaging and transit methods reveal the radius of the planet.
E. None of these choices are correct.
Answer: C
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RC Circuits: A resistor with a resistance of 360 ? is in a series circuit with a capacitor of capacitance 7.3 × 10-6 F. What capacitance must be placed in parallel with the original capacitance to change the capacitive time constant of the combination to three times its original value?
Fill in the blank(s) with the appropriate word(s).
Why didn't a planet form in the region of the solar system now occupied by the asteroid belt?
A. It was too cold for a rocky planet to form beyond Mars. B. Orbital resonances with Jupiter disrupted orbits in this region. C. Gravitational encounters with jovian planets kicked most of this material out into the Oort cloud. D. There was never enough material to form a planet.
Wave #1 has frequency f1 and wavelength ?1 . Wave #2 has frequency f2 = 6 f1 and wavelength ?2 = 2?1 . How does the speed v2 of wave #2 compare with the speed v1 of wave #1?
a. v2 = 12v1 b. v2 = 6v1 c. v2 = 1.5v1 d. v2 = v1/6
Why is our Jupiter not a "hot Jupiter"?
What will be an ideal response?