A battery placed in circuits with different load resistances can be considered as a source of constant
1.emf.
2.current.
3.terminal voltage.
4.nothing.
1
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Identify the FALSE statement. Cosmology:
is the study of the structure and evolution of the Universe. has ancient beginnings in many cultures. was dominated by the geocentric model for centuries. became more scientific and modern with the work of Renaissance thinkers like Copernicus, Kepler, Galileo, and Newton. currently advocates the heliocentric model, which states that the Sun, not the Earth, is the center of the Universe.
The force a spring exerts on a body is a conservative force because
a. a spring always exerts a force opposite to the displacement of the body. b. a spring always exerts a force parallel to the displacement of the body. c. the work a spring does on a body is equal for compressions and extensions of equal magnitude. d. the work a spring does on a body is equal and opposite for compressions and extensions of equal magnitude. e. the net work a spring does on a body is zero when the body returns to its initial position.
The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm,
and x = 120 cm, respectively. What is the x component of the net electrostatic force exerted on the -9.0 ?C charge by the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) -0.55 N B) 0.55 N C) 0.64 N D) 0.41 N E) -0.41 N
Red and orange stars are found evenly spread throughout the galactic disk, but blue stars are typically found
A) only in or near star-forming clouds. B) in the halo. C) only in the central bulge. D) also evenly spread throughout the galactic disk.