A centrifuge in a medical laboratory rotates at a rotational speed of 3600 rev/min. When switched off, it makes 50 complete turns at a constant angular acceleration before coming to rest
(a) What was the magnitude of the angular acceleration of the centrifuge as it slowed down?
(d) How long did it take for the centrifuge to come to rest after being turned off?
(a) 230 rad/s2 (b) 1.7 s
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The type of EM wave having the highest frequency is
a. ultraviolet. b. infrared. c. x-rays. d. microwave. e. gamma rays.
Ocean waves with a wavelength of 120 m are coming in at a rate of 8 per minute. What is their speed?
a. 8.0 m/s b. 16 m/s c. 24 m/s d. 30 m/s e. 4.0 m/s
People settle on floodplains because
A) the chance of flooding is very rare. B) floodplain soil is nutrient rich and good for agriculture. C) of river access. D) river access and rich soils.
The EEF shown is incorrectly drawn because
A. It curves toward the axis in a forbidden region or away from the axis in an allowed region.
B. Its wavy part doesn’t have the right number of bumps.
C. The amplitude of the wavy part varies incorrectly.
D. The wavelength of the wavy part varies incorrectly.
E. One of the exponential-like tails has the wrong length.