The ________ variables in the closer globular clusters were used by Harlow Shapley to find their distances
Fill in the blank(s) with correct word
RR Lyrae
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Why was the recent discovery that planets more massive than Jupiter orbit nearby stars in small orbits surprising?
A. The nebular hypothesis predicts that close-in planets should have formed a second star. B. Because according to the nebular hypothesis, massive planets should only form away from their star. C. The density of these planets is very high. D. According to the nebular hypothesis, planets cannot be larger than Jupiter.
Bohr's atomic theory predicted energy levels for hydrogen of En = (2 ?2 k2 e4m)/(hn)2. If instead we place 1 electron in "orbit" about a bare nucleus of atomic number Z, how do you expect Z to be incorporated into the En formula and why?
What will be an ideal response?
A capacitor, in addition to storing charge, also stores electrical energy
Indicate whether the statement is true or false
Recently, superconducting wire was made using magnesium diboride (S. Jin, H. Mavoori, C. Bower, and R. B. Van Dover, "High critical currents in iron-clad superconducting MgB2 wires," Nature 411, 563 (2001))
This is assumed to hold the promise of cheap efficient energy transmission. Explain how this might be true.