A rotating flywheel can be used as a method to store energy. If it has 2.0 × 10^6 J of kinetic energy when rotating at 400 rad/s, and if a frictional torque of 4.0 Nm acts on the system, in what interval of time would the flywheel come to rest?
a. 3.5 min
c. 14 min
b. 42 min
d. 21 min
B
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In comparing the Terrestrial planets, which planet is most similar in size to Earth?
a. Mercury b. Venus c. Mars d. the Moon e. Neptune
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. The edges of the two mirrors meet at a 30° angle. A light ray that enters parallel to mirror 2 reflects from mirror 1 and then from mirror 2 . The angle of reflection of that ray from mirror 2 is
a. 0°. b. 30°. c. 60°. d. 90°. e. 120°.
A camera used for aerial surveillance has a lens with a 30-cm maximum aperture and a 42-cm focal length
Assume light of 550-nm wavelength is used and that the resolution of the camera is limited solely by diffraction. What is the angular resolution of the camera at maximum aperture? A) 2.2 µrad B) 1.6 µrad C) 6.3 µrad D) 3.2 µrad E) 4.5 µrad
Why are nuclear engineers concerned about neutron embrittlement in fission power plants?
What will be an ideal response?