Which of these is the likely progenitor of a type I supernova?
A) a mass-transfer binary, with the white dwarf already at 1.3 solar masses
B) a contact binary, with the neutron star at 2.3 solar masses
C) an evolved red giant which is just starting to make silicon in its core
D) an evolved blue supergiant that is about to experience the helium flash
E) a helium-neon white dwarf
A
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The fastest we could accelerate a nuclear-powered rocket to is approximately
A) 50% of the speed of light B) 0.001% of the speed of light C) 0.1% of the speed of light D) 10% of the speed of light
What technique for measuring distance can you use to discover Hubble's Law?
A.) Cepheid variables in galaxies. B.) White dwarf supernovae in galaxies. C.) Redshifts of bright objects in galaxies. D.) A and B. E.) All of the above.
A spar buoy is a cylindrical object that floats with its axis in the vertical direction
When it is disturbed a distance h from its equilibrium position, the magnitude of the restoring force is equal to ?ghS, where ? is the density of the water and S is the cross-sectional area of the cylinder. A certain spar buoy has a mass of 150 kg, a cross-sectional area of 2.50 m2, and is floating in seawater, ? = 1025 kg/m3. What is the frequency of ocean waves which will cause it to resonate? A) 12.9 Hz B) 2.06 Hz C) 7.19 Hz D) 17.1 Hz E) 2.72 Hz
Processes can proceed from disorder to order
A) when input energy is supplied. B) on an everyday occurrence. C) never. D) none of the above