A cube of water ice (? = 0.917 × 103 kg/m3) is placed in mercury (? = 13.6 × 103 kg/m3), which is liquid at 0° Celsius. If we ignore any possible melting of the ice cube and problems with the surface tension of mercury, the fraction of the ice cube that floats above the surface of the mercury is
A. 0.067 4.
B. 0.073 5.
C. 0.926.
D. 0.933.
E. 1.00.
Answer: D
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A uniform ball with diameter of 10 cm rolls without slipping on a horizontal tabletop. The moment of inertia of the ball about an axis through its center is 2.2 × 10-3 kg ? m2,
and the translational speed of its center is 0.45 m/s. (a) What is its angular speed of the ball about its center of mass? (b) What is the rotational kinetic energy of the ball? (c) What is the ball's angular momentum about its center of mass?
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 approaches mirror 1 is parallel to mirror 2 . The angle of reflection of that ray from mirror 1 is
a. 0°. b. 30°. c. 60°. d. 90°. e. 120°.
What is the direction of 
in the wave as it passes S?
A. A B. B C. C D. D E. Toward the viewer. F. Away from the viewer. T. The vector is zero. G. AA H. BB I. CC J. DD
Gravity becomes separate from the other forces at the:
A) decoupling Event, about a million years after the Big Bang. B) end of the Planck Era, about 10-43 seconds after the Big Bang. C) end of the Inflationary Epoch, about 10-32 seconds into creation. D) beginning of particle production, about .0001 seconds into the universe. E) end of electron production, about a minute after creation.