A planet's density can be measured by combining
A) Doppler and astrometric observations.
B) Doppler and transit observations.
C) spectral observations of the planet's atmosphere.
D) any method that measures the gravitational tug of the planet on the star.
E) direct imaging from the new generation of space telescopes.
B
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A uniform rod (mass m = 1.0 kg and length L = 2.0 m) pivoted at one end oscillates in a vertical plane as shown below. The period of oscillation (in s) is approximately
?
?
a.
4.0.
b.
1.6.
c.
3.2.
d.
2.3.
e.
2.0.
When a grating having 5000 lines/cmis illuminated by monochromatic light, the angle between the central maximum and the fourth order maximum is 47.2°. What is the wavelength of the light?
A) 138 nm B) 183 nm C) 367 nm D) 637 nm
The radial distance to the event horizon from the singularity of a black hole is called
a. the Roche limit. b. the Schwarzschild radius. c. the Hubble unit. d. none of the above.
Outlets on a household circuit are arranged in
A) neither series or parallel. B) series. C) parallel. D) a combination of series and parallel. E) not given