The electron density in copper is 8.49 × 10^28 electrons/m3 . The electron charge is e = -1.60 × 10^-19 C. When a 1.00 A current is present in a copper wire with a 0.40 cm2 cross-section, the electron drift velocity, in m/s, with direction defined relative to the current density, is
a. -1.84 × 10^-6.
b. +1.84 × 10^-6.
c. -1.84.
d. -5.43 × 10^5.
e. +5.43 × 10^5.
A
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Two balls are thrown from the top of a building. One is thrown up and the other is thrown down, both with the same initial speed. What are their speeds when they hit the street?
A. they are traveling at the same speed B. the one thrown down is traveling faster C. the one thrown up is traveling faster D. it depends on the height of the building
A skier leaves a ski jump with a horizontal velocity of 29.4 m/s. The instant before she lands three seconds later, the magnitudes of the horizontal and vertical components of her velocity are:
a. 0; 29.4 m/s. b. 29.4 m/s; 0. c. 29.4 m/s; 29.4 m/s. d. 29.4 m/s; 41.6 m/s. e. 41.6 m/s; 41.6 m/s.
In the context of luminosity classes,__________is a subgiant (IV)
A) Altair B) Rigel C) Polaris D) Adhara
By mass, the interstellar medium in our region of the Milky Way consists of
A) 70% Hydrogen, 30% Helium. B) 70% Hydrogen, 28% Helium, 2% heavier elements. C) 70% Hydrogen, 20% Helium, 10% heavier elements. D) 50% Hydrogen, 50% Helium. E) 50% Hydrogen, 30% Helium, 20% heavier elements.