In the Drude model of electrical conduction, the current density is directly proportional to
a. the average time interval between successive collisions.
b. the number of charge carriers per unit volume.
c. the square of the electron charge.
d. the electric field present in the wire.
e. the product of all four quantities listed above.
e
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Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter. B) its density remains constant over time, so it is not important in the early Universe. C) combined with dark matter, it will ultimately produce a closed universe. D) that it was revealed with Type II supernovae distances in the late 1990s. E) that it makes up 90% of all the matter and energy in the whole universe.
Most stars are born in clusters containing thousands of stars
Indicate whether the statement is true or false
What conditions are required for a solar eclipse?
A) The phase of the Moon must be new, and the Moon's orbital plane must lie in the ecliptic. B) The phase of the Moon can be new or full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. C) The phase of the Moon must be full, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun. D) The phase of the Moon must be full, and the Moon's orbital plane must lie in the ecliptic. E) The phase of the Moon must be new, and the nodes of the Moon's orbit must be nearly aligned with Earth and the Sun.
A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 10^5 N/m2
a. 1.0 ATM b. 4.2 ATM c. 7.2 ATM d. 9.7 ATM e. 8.2 ATM