Force on a Moving Charge: After landing on an unexplored Klingon planet, Spock tests for the direction of the magnetic field by firing a beam of electrons in various directions and by recording the following observations:Electrons moving upward feel a magnetic force in the northwest direction.Electrons moving horizontally toward the north are pushed downward.Electrons moving horizontally toward the southeast are pushed upward.Mr. Spock therefore concludes that the magnetic field at this landing site is in which direction?
A. toward the east
B. toward the northeast
C. toward the southwest
D. toward the southeast
E. toward the west
Answer: C
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
At about the position of the Earth, in the early solar nebula, the temperature was about 1,000 K, cool enough for ________ to condense out of the gas
Fill in the blank(s) with correct word
A box is moved 20 m across a smooth floor by a force making a downward angle with the floor, so that there is effectively a 10 N force acting parallel to the floor in the direction of motion and a 5 N force acting perpendicular to the floor. The work done is
A. 300 J. B. 100 J. C. 200 J. D. 5.0 J. E. 20 J.
In an undeformed sequence of rocks, the youngest rocks are found
A) at the bottom of the rock sequence. B) as an eroded bed. C) at the top of the rock sequence. D) in the core of an anticline.