An electron, moving toward the west, enters a uniform magnetic field. Because of this field the electron curves upward. The direction of the magnetic field is
A) towards the south.
B) upward.
C) towards the west.
D) towards the north.
E) downward.
D
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A white dwarf is composed of
a. hydrogen nuclei and degenerate electrons. b. helium nuclei and normal electrons. c. carbon and oxygen nuclei and degenerate electrons. d. degenerate iron nuclei. e. a helium burning core and a hydrogen burning shell.
A popular swinging-balls apparatus (Newton's cradle) consists of a series of identical elastic balls suspended by strings so they barely touch each other
When two balls are pulled away from one end and released, they strike the row of balls and two balls pop out from the other end. If instead, one ball popped out with twice the speed, this would violate the conservation of A) momentum. B) energy. C) both of these D) none of the above
Captain Ray, on the Galactic Explorer, sets off bright signal lights at the two ends of his spaceship so that they are seen as flashing simultaneously by General Kay, who is watch the ship go by. General Kay concludes that she was next to the midpoint of the ship at the instant when the lights flashed in her reference frame. This can only happen if Captain Ray, at the center of the Galactic
Explorer, a. sees the lights flash simultaneously in his coordinate system. b. sees the bow (front) light flash before the aft (rear) light. c. sees the aft (rear) light flash before the bow(front light. d. can calculate that the light flashes reach General Kay so that the flash from the bow light reaches her before the flash from the aft light. e. can calculate that the light flashes reach General Kay so that the flash from the aft light reaches her before the flash from the bow light.
What is the velocity acquired by a freely falling object 5 seconds after being dropped from a rest position? What is it 6 seconds after?