The Sun's average density is about the same at Jupiter's, suggesting a similar composition
Indicate whether the statement is true or false
TRUE
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An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 15 cm past the first lens. The second lens has a focal length of 40 cm. Where is the final image formed?
A) 25 cm in front of the second lens B) 8 cm in front of the second lens C) 8 cm after the second lens D) 10 cm after the second lens E) 25 cm after the second lens
What is meant by the "normal" to a surface?
a. a line perpendicular to the surface at a given point b. the angle between the surface and the light ray c. a line parallel to the surface at a given point d. the direction of a reflected ray
If a particle with a charge of 2 coulombs moves through a potential difference of 12 volts, its change in kinetic energy will a have magnitude of
A) 12 J. B) 6 J. C) 8 J. D) 1/6 J. E) 24 J.
Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit:
A) mostly in the infrared. B) only in the visible. C) mainly in the gamma. D) virtually no radiation at all. E) equally across the entire electromagnetic spectrum.