A(n) ______________ image is defined as one that can be brought to a focus on a screen
a. virtual
b. real
c. upright
d. inverted
b
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Differential rotation of the Sun is
a. heating in the chromosphere and corona that makes them hotter than the photosphere. b. the magnetic dynamo inside the Sun. c. the equatorial regions of the Sun rotating more rapidly than the polar regions. d. the origin (and subsequent disappearance of) Sunspots first near the poles then closer to the Sun's equator as the Sunspot cycle progresses. e. the rotation of the Sun's southern and northern hemispheres in opposite directions.
Coulomb's Law: A hydrogen nucleus, which has a charge +e, is situated to the left of a carbon nucleus, which has a charge +6e. Which statement is true?
A. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is equal to the force exerted on the carbon nucleus. B. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is greater than the force exerted on the carbon nucleus. C. The electrical force experienced by the hydrogen nucleus is to the left, and the magnitude is less than the force exerted on the carbon nucleus. D. The electrical force experienced by the hydrogen nucleus is to the right, and the magnitude is equal to the force exerted on the carbon nucleus.
Suppose your telescope has perfect mirrors and is limited only by diffraction. If you are viewing with light of 400 nm wavelength,
what diameter mirror in a space telescope would have 1.0-km resolution of objects on Mars when viewed from above the earth at a time when the Earth-Mars distance of 80 million kilometers? A) 39 km B) 3.9 m C) 3.9 km D) 39 m E) 390 m
A wire (mass = 50 g, length = 40 cm) is suspended horizontally by two vertical wires which conduct a current I = 8.0 A, as shown in the figure. The magnetic field in the region is into the paper and has a magnitude of 60 mT. What is the tension in either wire?
a.
0.15 N
b.
0.68 N
c.
0.30 N
d.
0.34 N
e.
0.10 N