The value of the momentum of a system is the same at a later time as at an earlier time if there are no
a. collisions between particles within the system.
b. inelastic collisions between particles within the system.
c. changes of momentum of individual particles within the system.
d. internal forces acting between particles within the system.
e. external forces acting on particles of the system.
e
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Suppose there is a cloud containing interstellar dust between a star and us. How will the dust affect the light we see from the star?
A) It makes the star appear dimmer and redder in color. B) It makes the star appear dimmer and bluer in color. C) It does not affect the star's brightness but makes it appear redder in color. D) It makes the star appear dimmer but does not affect the star's color.
If the hypothesis tracing the extinction of the dinosaurs to an impact is correct, the dinosaurs died off largely because ________
A) the impact caused massive earthquakes worldwide B) radiation from iridium in the asteroid caused the dinosaurs to die of cancer C) of global climate effects initiated by dust and smoke that entered the atmosphere after the impact D) of injuries suffered from direct hits of pieces of the asteroid or comet
If a = 1.0 cm, b = 3.0 cm, and I = 30 A, what is the magnitude of the magnetic field at point P?
a.
0.62 mT
b.
0.59 mT
c.
0.35 mT
d.
0.31 mT
e.
0.10 mT
If the current in the 4.0-? resistor is 1.4 A, what is the magnitude of the potential difference, VA ? VB?
a.
69 V
b.
55 V
c.
62 V
d.
48 V
e.
31 V