An ice skater has a moment of inertia of 5.0 kg ? m2 when her arms are outstretched, and at this time she is spinning at 3.0 rev/s
If she pulls in her arms and decreases her moment of inertia to 2.0 kg ? m2, how fast will she be spinning?
A) 2.0 rev/s
B) 3.3 rev/s
C) 7.5 rev/s
D) 10 rev/s
C
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Hardness is a measure of the resistance of a material to _____________by an indenter.
Fill in the blank(s) with the appropriate word(s).
A camera used for aerial mapping has a lens with a 30-cm diameter maximum aperture and a 42-cm focal length. Light of 550 nm wavelength is used to form the image
Assuming that the resolution of the camera is limited only by diffraction, what is the smallest angle (in milliradians) subtended by an object on the ground that can be resolved by this camera at maximum aperture? A) 1.6 mrad B) 2.2 mrad C) 3.2 mrad D) 4.5 mrad E) 6.3 mrad
Charge of uniform surface density (0.20 nC/m2) is distributed over the entire xy plane. Determine the magnitude of the electric field at any point having z = 2.0 m
a. 17 N/C b. 11 N/C c. 23 N/C d. 28 N/C e. 40 N/C
Earth doesn't experience a solar eclipse every month because
a. of unpredictable weather patterns. b. the Moon always keeps its same side toward the Earth. c. the Moon's orbit plane is not aligned with the Earth's orbit plane. d. its sometimes nighttime when the eclipse occurs. e. sometimes the Moon is too far away.