To prevent injuries, people should do all of the following EXCEPT _______
Fill in the blank(s) with the appropriate word(s).
Answer: continue to exercise even when sick
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Compared to the star it evolved from, a red giant is
A) hotter and dimmer. B) the same temperature and brightness. C) cooler and brighter. D) cooler and dimmer. E) hotter and brighter.
Nonreflective coatings for camera lenses reduce the loss of light at various surfaces of multi-lens systems, as well as preventing internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride (n = 1.38) on
flint glass (n = 1.66) that will cause destructive interference of reflected light of wavelength ? = 550 nm, a wavelength which is near the middle of the visual spectrum.
Suppose a particle’s four-momentum vector has components [pt, px, py, pz] = [5 kg, 3 kg, 0, 0]. What is this particle’s mass?
A. 5 kg
B. 8 kg
C. 4 kg
D. 3 kg
E. 
kg
F. Other (specify)
A bucket of water with total mass 30 kg is attached to a rope, which in turn is wound around a 0.050 m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the end of the cylinder and the moment of inertia of cylinder and crank is 0.12 kg×m2 . If the bucket is raised to the top of the well and released, what is the acceleration of the bucket as it falls
toward the bottom of the well? (Assume rope's mass is negligible, that cylinder turns on frictionless bearings and that g = 9.8 m/s2.) a. 3.2 m/s2 c. 7.4 m/s2 b. 3.8 m/s2 d. 9.8 m/s2