The central cores of which type of star is the lowest temperature?
a. protostars.
b. massive main-sequence stars.
c. white dwarf stars.
a
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Moving electric charges will interact with
A) an electric field. B) a magnetic field. C) both of these D) none of the above
A 0.20-kg mass is oscillating on a spring over a horizontal frictionless surface. When it is at a displacement of 2.3 cm for equilibrium it has a kinetic energy of 1.5 J and a spring potential energy of 2.3 J. What is the maximum speed of the mass during its oscillation?
a. 4.4 m/s b. 0.16 m/s c. 6.2 m/s d. 4.8 m/s e. 3.0 m/s
Two capacitors with CA greater than CB and are connected in series with a battery. Which of the following is true?
a. There is more charge stored on CA. b. There is more charge stored on CB. c. There is the same charge stored on each capacitor. d. There is the same potential difference across both capacitors.
What is the binding energy per nucleon of 197Au (atomic number = 79)? (The following information regarding atomic masses will be needed: 197Au, 196.966543 u; hydrogen, 1.007825 u; neutron, 1.008665 u; also 1 u = 931.5 MeV/c2.)
a. 8.3 MeV c. 7.7 MeV b. 7.9 MeV d. 7.3 MeV