How long after the Big Bang was the Planck time, before which our current theories are completely unable to describe conditions in the universe?
A) 10-10 second
B) 10-35 second
C) 10-43 second
D) 3 minutes
E) 300,000 years
C
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Angular Momentum: 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?
What will be an ideal response?
The astronomical phenomenon that created the elements heavier than iron is
A) black holes. B) supernova explosions. C) the collapse of a star to a white dwarf. D) neutron stars. E) the birth [or formation] of stars.
A deuteron, with the same charge but twice the mass of a proton, moves with a speed of 6.0 × 10^5 m/s perpendicular to a uniform magnetic field of 0.20 T. Which of the paths described below would it follow? (qp = 1.6 × 10^-19 C and md = 3.34 × 10^-27 kg)
a. a circular path of 6.3-cm radius c. a circular path of 3.1-cm radius b. a circular path of 1.6-cm radius d. a straight line path
A beam of light (f = 5 × 1014 Hz) enters a piece of glass (n = 1.5). What is the frequency of the light while it is in the glass?
A) 5 × 1014 Hz B) 7.5 × 1014 Hz C) 3.33 × 1014 Hz D) 5 × 1013 Hz E) 7.5 × 1013 Hz