State the law of conservation of angular momentum for a system
What will be an ideal response?
The total angular momentum of a system remains constant if the net external torque acting on the system is zero.
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The triple-alpha process
a. controls the pulsations in Cepheid variable stars. b. is the nuclear fusion of hydrogen to helium in massive stars. c. is the process that produces the neutrinos we receive from the Sun. d. requires a temperature of about 5,000,000 K to operate. e. occurs during helium flash.
The Kepler mission discovered thousands of stars by using
A) the transit method. B) the Doppler method. C) the astrometric method. D) direct detection. E) gravitational lensing.
The potential difference between the terminals of a battery, when current flows to an external circuit, is referred to as the
A) emf. B) terminal voltage.
Radiation pressure: A radiometer has two square vanes (1.0 cm by 1.0 cm), attached to a light horizontal cross arm, and pivoted about a vertical axis through the center, as shown in the figure. The center of each vane is 6.0 cm from the axis. One vane is silvered and it reflects all radiant energy incident upon it. The other vane is blackened and it absorbs all incident radiant energy. Radiant energy, having an intensity of 300 W/m2, is incident normally upon the vanes. What is the radiation pressure on the blackened vane? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T ? m/A, ?0 = 8.85 × 10-12 C2/N ? m2) 
A. 1.0 × 10-10 Pa B. 1.0 × 10-9 Pa C. 1.0 × 10-8 Pa D. 1.0 × 10-7 Pa E. 1.0 × 10-6 Pa