_____________ do not have enough mass to sustain nuclear fusion in its core but are more massive than planets
Fill in the blank(s) with correct word
Brown dwarfs
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Two very small plastic balls of equal mass are released from rest. One of them carries +10 µC of excess charge and the other one carries +1µC of charge
No other charges or fields are present. Which of the following statements are true about them as they move away from each other? (There may be more than one correct choice.) A) The acceleration of the 10-µC ball is 10 times that of the 1-µC ball. B) The balls always have accelerations of equal magnitude. C) The speed of the balls keeps increasing. D) The acceleration of the balls keeps increasing. E) The acceleration of the 1-µC ball is 10 times that of the 10-µC ball.
Why do disks form around young stars?
A) The surrounding gas can only approach the star from a single direction. B) Collisions between gas particles flatten the rotating gas cloud. C) The rotation of the cloud causes gas to be spun outward from the central star. D) Intense winds from nearby massive stars flatten the gas cloud.
Light is refracted through a diamond. If the angle of incidence is 30°, and the angle of refraction is 12°, what is the index of refraction?
a. 1.3 b. 2.4 c. 2.6 d. 1.8 e. 0.4
What time of year is it dark all day (and night) at the South pole?
a) never b) June c) December d) September e) March