Which of the following does not yield information on jovian planet interiors?
A) Earth-based observations of the mass and size of the planets
B) spacecraft measurements of magnetic and gravitational fields
C) laboratory studies and theoretical models
D) spectroscopy of the cloud layers
E) detailed observations of planetary shapes
D
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The focal length of a magnifying glass is 15 cm. If the near point of a person is 25 cm, what is the magnification of this glass for this person when his eyes are focused at infinity?
A) 1.7 B) 2.7 C) 3.7 D) 4.7 E) 5.7
A charge Q accumulates on the hollow metallic dome, of radius R, of a Van de Graaff generator. A probe measures the electric field strength at various points outside the sphere's surface. By what factor will the electric field value at the 2R distance be changed if the charge value were increased to (5/3)Q?
a. 3/5 c. 5/3 b. (5/3)2 d. (3/5)2
Express 50 mi/h in units of meters per second. (1 mi = 1609 m)
A) 49 m/s B) 2.2 m/s C) 22 m/s D) 45 m/s
Let's say that you are spinning a fixed-frequency buzzer attached to a string in a circular path around you at a constant speed. The frequency that you hear as you spin the buzzer sity?
1.is greater than the frequency of the buzzer and it is constant. 2.alternates between being greater than the frequency of the buzzer and less than the frequency of the buzzer. 3.is less than the frequency of the buzzer and it is constant. 4.is the same as the frequency of the buzzer.