Suppose that a car traveling to the west begins to slow down as it approaches a traffic light. Which of the following statements about its acceleration is correct?
A) The acceleration is toward the east.
B) Since the car is slowing down, its acceleration must be negative.
C) The acceleration is zero.
D) The acceleration is toward the west.
A
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The smallest sort of interplanetary matter is called:
A) an asteroid. B) interplanetary dust. C) a meteoroid. D) a Kuiper Belt Object. E) a comet.
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
A binary star system in the constellation Orion has an angular separation between the two stars of 1.2 × 10^?5 radians. If ? = 5 × 10^?7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars?
a. 10 cm b. 5 cm c. 50 cm d. 1 m e. 4 cm
An object, placed 12.0 cm from a lens, produces an image with a magnification of 5.0. What is the focal length of the lens?
A) 24 cm B) 18 cm C) 60 cm D) 15 cm E) 9 cm