Radioactivity in the Earth is responsible for
A. helium we use in balloons
B. warmth to keep the oceans liquid
C. creation of the oxygen we breathe
D. navigation of birds
Answer: A. helium we use in balloons
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A stationary firecracker explodes, breaking into two parts of equal mass. One part is moving north at 20 m/s. The velocity of the other part is
A) 20 m/s with a direction that's impossible to predict without more information. B) also northward at 20 m/s. C) impossible to predict without more information. D) zero. E) southward at 20 m/s.
Spherical Mirrors: A beam of light that is parallel to the principal axis strikes a convex mirror. What happens to the reflected beam of light?
A. It also is parallel to the principal axis. B. It is perpendicular to the principal axis. C. It appears to be coming from the focal point on the other side of the mirror. D. It appears to be coming from the center of curvature of the mirror. E. It appears to be coming from a point between the focal point and the center of curvature of the mirror.
The difference between the pressures inside and outside a tire is called __________
Fill in the blank(s) with correct word
Uniform Circular Motion: The curved section of a horizontal highway is a circular unbanked arc of radius 740 m. If the coefficient of static friction between this roadway and typical tires is 0.40, what would be the maximum safe driving speed for this horizontal curved section of highway?
A. 54 m/s B. 52 m/s C. 50 m/s D. 48 m/s E. 46 m/s