What is the origin of the lobes often observed on opposite sides of radio galaxies?
A. black holes orbiting the center
B. high-speed electrons spiraling around magnetic field lines
C. supernovae from massive stars
D. gas ejected from the core of the galaxy
E. hot planetary nebulas surrounding the galaxy
Answer: B
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Quito, Ecuador, is at an altitude of 2,850 meters above sea level, while New York City is at sea level. If you are preparing a hard-boiled egg in Quito, it would have to be placed in boiling water
A) for the same amount of time as in New York. B) for a shorter time than in New York. C) for a longer time than in New York. D) There is not enough information to answer this question.
This figure shows that the image of a candle inside the focal point of a concave mirror is virtual, erect, and magnified. Where would the candle's image be if it were placed exactly at the center of curvature, point C?
a. A real inverted image is formed at an infinite distance to the left and infinite in size. b. A virtual erect image is formed at an infinite distance to the right and infinite in size. c. The inverted image is formed with the same size as the object, also located at the focal point, but on the opposite size of the optical axis.
What is the acceleration due to Earth's gravity at a distance of 10 Earth radii from Earth's center?
A. 10 m/s2 B. 1 m/s2 C. 0.1 m/s2 D. 0.01 m/s2
The Roche limit is the
a. distance from the sun within which a planet can not retain an atmosphere. b. minimum mass of an object in the solar system that would be classified as a planet. c. maximum separation distance between the sun and a given planet. d. distance from Earth at which we loose radio communication with a satellite. e. distance from a planet within which a planet can not hold itself together.