A spear is thrown by you at a very high speed. As it passes, you measure its length at 1?2 its normal length. From this you conclude that the moving spear's mass must be
A. one-half its rest mass.
B. twice its rest mass.
C. four times its rest mass.
D. None of these choices are correct.
B. twice its rest mass.
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____ have elongated nuclei with spiral structure extending from the ends of the elongations. The Milky Way is a member of this class of galaxy
a. Spiral galaxies b. Barred spiral galaxies c. Elliptical galaxies d. Irregular galaxies e. S0 galaxies
Why do white dwarf supernovae all have approximately the same maximum luminosity?
What will be an ideal response?
What is the energy of a photon that has the same wavelength as a 11.4-eV electron? (h = 6.63 × 10^?34 J?s, me = 9.11 × 10^–31 kg, 1 eV = 1.6 × 10^–19 J)
a. 1140 eV b. 32 eV c. 103 eV d. 3420 eV e. 1030 eV
A flux of 4.0 × 10-5 T ? m2 is maintained through a coil of area 7.5 cm2 for 0.50 s. What emf is induced in this coil during this time by this flux?
A) 8.0 × 10-5 V B) 4.0 × 10-5 V C) 3.0 × 10-5 V D) 2.0 × 10-5 V E) No emf is induced in this coil.