A plot of land contains 5.8 acres. How many square meters does it contain? [1 acre = 43,560 ft2]
A) 2.3 × 104 m2
B) 7.1 × 103 m2
C) 7.0 × 104 m2
D) 5.0 × 104 m2
A
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By using a compass to measure the magnetic field direction at various points adjacent to a long straight wire, you can show that the wire's magnetic field lines are
A. straight lines in space that go from one magnetic charge to another. B. straight lines in space that are parallel to the wire. C. straight lines in space that are perpendicular to the wire. D. circles that have their centers on the wire and lie in planes perpendicular to the wire. E. circles that have the wire lying along a diameter of the circle.
As a star's evolution approaches the Type II supernova, we find
A) photo disintegration of iron nuclei begins at 10 billion K to ignite the supernova. B) helium to carbon fusion takes at least 100 million K to start. C) the heavier the element, the higher the temperature to fuse it. D) the heavier the element, the less time it takes to make it. E) All of the above are correct.
The purpose of prescription glasses for a near-sighted person is to bring the apparent positions of distant objects
A. to the far point of the eye. B. to the near point of the eye. C. to the retina of the eye. D. none of the above.
A concave mirror has a focal length of 20 cm. A paraxial beam of light coming from a distant object forms its image at the focal point
If a small plane mirror is placed at the center of curvature with its reflecting side facing the focal point, where is the final image? A) 3 cm in front of the mirror B) 40 cm in front of the mirror C) 50 cm in front of the mirror D) 60 cm in front of the mirror E) 70 cm in front of the mirror