A disk is suspended by a nail such that the pivots in a vertical plane about a point on the edge of the disk. If the period of oscillation of the disk is 1.25 s, what is the disk’s radius?
A. 26 cm
B. 78 cm
C. Cannot answer without knowing the disk's mass
D. 51 cm
A. 26 cm
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Astronomer Alan says the universe is expanding at one rate and Astronomer Wendy says it is expanding at a faster rate. All other things being equal, which astronomer would say that the universe is older?
A) Wendy B) Alan C) neither
The acceleration of an object as a function of time is given by a(t) = (3.00 m/s3)t. If the object is at rest at time t = 0.00 s, what is the velocity of the object at time t = 5.00 s?
A) 15.0 m/s B) 37.5 m/s C) 0.00 m/s D) 12.0 m/s E) 75.0 m/s
A Doppler weather radar operates at a frequency of 3.40 GHz. The wave from this radar system reflects from an approaching weather system moving with a speed of 39.0 m/s. What is the difference in frequency between the outgoing and returning waves?
A) 442 Hz B) 351 Hz C) 419 Hz D) 322 Hz E) 670 Hz
The separation of white light into its component
colors is called a) dispersion. b) polarization. c) diffraction. d) refraction.