A spool of thread has an average radius of 1.00 cm. If the spool contains 126 m of thread, how many turns of thread are on the spool? "Average radius" allows us to not need to treat the layering of threads on lower layers
a. 100
c. 2000
b. 1000
d. 62,800
C
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State a testable prediction of the nebular theory that has been confirmed by observations of extrasolar planets. Does this confirmation mean the theory is completely correct?
What will be an ideal response?
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.
Kevlar forms from the monomers shown. Show the structure of the polymer, in the usual “bracket” format
The tail of a comet always points
A) away from the Sun and becomes longest and brightest at perihelion. B) toward Earth and never varies. C) away from the Sun and disappears at perihelion. D) toward the Sun and disappears at perihelion. E) in the direction of the comet's motion.