What is the observational difference between Types I & II supernovae?
A: Ia's come from white dwarfs in binaries whereas II's come from dying massive stars
B: I's are brighter than II's
C: I's are fainter than II's
D: I's are Hydrogen poor while II's are Hydrogen rich
E: I's have no central remnant while II's have neutron stars
Ans: D: I's are Hydrogen poor while II's are Hydrogen rich
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The rate of change in a system depends upon the _____________enthalpy.
Fill in the blank(s) with the appropriate word(s).
What law explains why a rotating, collapsing cloud forms a flat protostellar disk around a protostar?
A) Kepler's third law B) the universal law of gravitation C) Wien's law D) conservation of angular momentum
Suppose an astronomer proposed to build a major observatory on the campus of your school. Would it make a good observing site? Explain why or why not
What will be an ideal response?
A long solenoid (n = 1 500 turns/m) has a cross-sectional area of 0.40 m2 and a current given by I = (4.0 + 3.0t2) A, where t is in seconds. A flat circular coil (N = 300 turns) with a cross-sectional area of 0.15 m2 is inside and coaxial with the solenoid. What is the magnitude of the emf induced in the coil at t = 2.0 s?
a. 2.7 V b. 1.0 V c. 6.8 V d. 0.68 V e. 1.4 V