What two quantities did Edwin Hubble compare for a sample of galaxies to discover the expansion of the universe?
A) age and distance
B) velocity and distance
C) velocity and temperature
D) luminosity and distance
E) luminosity and temperature
B
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Shear Modulus: Opposing shearing forces of 3000 N are applied to the 3.00-cm × 4.00-cm faces of a metal block measuring 3.00 cm × 4.00 cm × 5.00 cm. By what distance does the block become slanted? The shear modulus for this metal is 8.10 × 1010 N/m2.
A. 1.54 × 10-6 m B. 5.56 × 10-7 m C. 9.88 × 10-7 m D. 3.08 × 10-6 m E. 6.98 × 10-6 m
Some superconductors are capable of carrying a very large quantity of current. If the measured current is 3.00 × 10^6 A, how many electrons are moving through the superconductor per second? (e = 1.60 × 10^?19 C)
a. 1.88 b. 4.6E+15 c. 7.1E+19 d. 2.9E+23
What are the quarks really called?
A.) Sleepy, Dopey, Grumpy, Sneezy, Bashful, and Doc. B.) Electron, proton, photon, positron, meson, and muon. C.) Charm, strange, anger, hope, peace, and love. D.) Up, down, top , bottom, strange, and charm. E.) Gluon, W+ boson, W- boson, Z boson, graviton, and photon.
Would switching your home from incandescent to compact fluorescent bulbs be a measure you would take? Why or why not? Explain your answer
What will be an ideal response?