What is the temperature of 3.0 moles of gas at a pressure of 250 kPa held in a volume of 15 L?
A) 150 K
B) 200 K
C) 250 K
D) 300 K
E) 350 K
A
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The magnitude of the magnetic force on a charge depends on
A. the velocity component perpendicular to the magnetic field. B. the magnitude of the charge. C. the magnitude of the magnetic field. D. the sign of the charge. E. Three of the items are correct.
The speed of light in a particular transparent medium is 5/8 the speed of light in a vacuum. What is the index of refraction of the material?
An explorer walks into a lab in a science building. She has a compass in her hand and finds that the south pole of her compass points toward the room's East wall when she is nearer that wall and toward the west wall when she is nearer that wall. You could explain this if magnetized metal had been installed in the East and West walls with North poles pointing into the room. If no magnetic material
was installed in the North or South walls of the room, she would expect that a. the south pole of the compass would tend to point toward those walls. b. the north pole of the compass would tend to point toward those walls. c. the compass needle would not point in any particular direction. d. the north pole of the compass needle would tend to point toward the centers of those walls, but the south pole would tend to point toward the sides of those walls. e. the south pole of the compass needle would tend to point toward the centers of those walls, but the north pole would tend to point toward the sides of those walls.
A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is
A) less. B) the same. C) more.