The United States consumes 2.5 × 10^19 J of energy each year. A typical solar flare releases 5.0 × 10^24 J of energy. How many years could we run the United States on the energy released by this solar flare if all of the released energy could be used?
a. 5 × 10^-6 years
b. 200,000 years
c. 1.25 × 10^44 years
d. about 12 years
e. 500 years
b
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The Hubble Law does not work for nearby galaxies because
A. nearby galaxies are contracting rather than expanding. B. it is difficult to take the spectrum of nearby galaxies as compared to distant galaxies. C. the Hubble law works for all galaxies; distance doesn't matter. D. the speed of nearby galaxies is affected by their gravitational interaction with one another.
Two mirrors are at right angles to one another. A light ray is incident on the first at an angle of 30°with respect to the normal to the surface. What is the angle of reflection from the second surface? ?
A. ?30° B. ?60° C. ?45° D. ?53° E. ?75°
A positive point charge q is placed off center inside an uncharged metal sphere insulated from the ground as shown. Where is the induced charge density greatest in magnitude and what is its sign?
?
?
a.
A; negative
b.
A; positive
c.
B; negative
d.
B; positive
e.
C; negative
An air-filled 39.1 ?H solenoid has a length 4.0 cm and cross-sectional area 0.60 cm2. How many turns are in this solenoid?
A) 1200 B) 12 C) 120 D) 144 E) 21000