A 75-N object is pulled on a horizontal surface by a horizontal pull of 50 N to the right. The friction force exerted on this object is 30 N to the left. What is the acceleration of the object?
A) 0.27 m/s2
B) 1.1 m/s2
C) 2.6 m/s2
D) 11 m/s2
C
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Ron is standing near a railroad track. A train is moving toward him at 60 mph, and it blows its horn. What will Ron notice as the train moves past him?
A) As the train moves away, the frequency of the horn will be higher than when the train comes closer. B) As the train approaches, the horn will sound higher in pitch than when the train moves away. C) The horn will produce a multiple echo effect as the train moves closer to Ron. D) There will be no change in the pitch of the horn as the train moves past Ron.
According to measurements made here on Earth, the distance to Alpha Centauri is about 4 light-years. If a spaceship is traveling toward Alpha Centauri at 0.999c, How far away is Alpha Centauri according to the travelers in the ship?
A) also about 4 light-years B) very slightly more than 4 light-years C) very slightly less than 4 light-years D) quite a bit less than 4 light-years E) quite a bit more than 4 light-years
You have connected a loudspeaker that is facing upwards to a variable frequency source and notice that a small screw has fallen into the loudspeaker
As you increase the frequency of the signal you notice that at a frequency of 20.0 Hz the screw no longer moves with the speaker but starts to leave the surface of the speaker intermittently. What must be the amplitude of the oscillations? A) 0.621 mm B) 2.45 mm C) 1.60 mm D) 0.893 mm E) 0.200 mm
Four equal +6.00-?C point charges are placed at the corners of a square 2.00 m on each side. (k = 1/4??0 = 8.99 × 109 N • m2/C2)
(a) What is the electric potential (relative to infinity) due to these charges at the center of this square? (b) What is the magnitude of the electric field due to these charges at the center of the square?