If two slide projectors are connected in series across the same 120 volt source, the current drawn from the source is __________
Fill in the blank(s) with correct word
3 amperes
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What protects Earth from the high energy particles ejected from the Sun (the solar wind)?
a. the troposphere b. the stratosphere c. the exosphere d. the magnetosphere e. the Van Allen radiation belts
A lens of focal length 40 mm is used as a magnifier. The object being viewed is 5.3 mm long, and is positioned at the focal point of the lens. The user of the magnifier has a near point at 25 cm. What is the angular magnification of the magnifier?
A) 6.3 B) 5.6 C) 6.9 D) 7.5 E) 8.1
A hobby rocket reaches a height of and lands from the launch point with no air resistance. What was the angle of launch?
A) 69.0° B) 67.4° C) 22.6° D) 44.8°
Weight and g: An piece of space debris is released from rest at an altitude that is two earth radii from the center of the earth. Compared to its weight on Earth, the weight of this debris is
A. zero. B. the same as on the surface of the earth. C. one-half of its weight on the surface of the earth. D. one-third of its weight on the surface of the earth. E. one-quarter of its weight on the surface of the earth.