The standard unit of distance in the mks system is the
a. centimeter
b. inch
c. kilometer
d. meter
e. second
d
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When a transparency sheet is rubbed with a tissue and the transparency and tissue are then held at rest a short distance apart,
A) the transparency and the tissue exert magnetic forces on each other, because the electron orbits in the two objects are all put into the same alignment. B) the two objects exert electric forces on each other, because electrons are rubbed off of one and onto the other. C) the two objects exert magnetic forces on each other, because electrons are rubbed off of one and onto the other. D) a spark will jump between them, because the rubbing causes electrons to jump from one object to the other. E) the two objects exert electric forces on each other, because the electron orbits in the two objects are all put into the same alignment.
Do you think it is possible that a 10-solar-mass main-sequence star could harbor an advanced civilization? Explain your reasoning
What will be an ideal response?
A ball is dropped from a rooftop of a building and falls for two seconds. The acceleration of gravity is 9.8 m/s2 . The ball is referred to at the two-second time. The velocity of the ball in m/s is
a. 0. b. 4.9. c. 9.8. d. 19.6. e. none of these.
A conducting rod (length = 2.0 m) spins at a constant rate of 2.0 revolutions per second about an axis that is perpendicular to the rod and through its center. A uniform magnetic field (magnitude = 8.0 mT) is directed perpendicularly to the plane of rotation. What is the magnitude of the potential difference between the center of the rod and either of its ends?
a. 16 mV b. 50 mV c. 8.0 mV d. 0.10 mV e. 100 mV