The percentage volume of unoccupied space in a material is called its
a. traction.
b. porosity.
c. permeability.
d. salinity.
b
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The spectral lines of a star will appear ________ if the star is moving away from the Earth.
A. blue shifted (i.e., shifted toward the shorter wavelengths) B. the same (no shift) C. red shifted (i.e., shifted toward the longer wavelengths)
A very thin horizontal, 2.00-m long, 5.00-kg uniform beam that lies along the east-west direction is acted on by two forces
At the east end of the beam, a 200-N force pushes downward. At the west end of the beam, a 200-N force pushes upward. What is the angular acceleration of the beam? A) 240 rad/s2 north B) 1.33 × 102 rad/s2 north C) zero D) 240 rad/s2 south E) 1.33 × 102 rad/s2 south
Which of the following is not a fundamental
quantity? a) Time b) Mass c) Length d) Area •
The energy generated by the Sun is released by the _______ to make _______ nuclei
a. fusion of H nuclei; He b. fusion of He nuclei; H c. fission of H nuclei; He d. fission of He nuclei; H