The presently accepted value of the Hubble constant gives an age of:
A) 4.5 billion years.
B) 8-9 billion years.
C) 14 billion years.
D) 18 billion years.
E) 22 billion years.
C
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A string, 0.28 m long and vibrating in its third harmonic, excites an open pipe that is 0.82 m long into its second overtone resonance. The speed of sound in air is 345 m/s. The speed of transverse waves on the string is closest to
A) 120 m/s. B) 110 m/s. C) 100 m/s. D) 98 m/s. E) 91 m/s.
Tripling the aperture diameter of a camera lens will change the light intensity admitted to the film by what factor?
a. 0.11 b. 0.33 c. 3.0 d. 9.0 e. 12.0
The maximum torque on a flat current-carrying loop occurs when the angle between the plane of the loop's area and the magnetic field vector is
A) 0°. B) 45°. C) 90°. D) 135°.
What is the spectral type of a main sequence star with a luminosity 100 times greater than the sun?
A) G B) A C) M D) O