Some massive stars only live a few million years
a. True
b. False
Indicate whether the statement is true or false
True
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You are alone in space and your tether brakes and you are floating motionless relative to your spaceship, which is located a frustrating 10 meters away. Your spacesuit has no jet pack and you have no air to spare. All you have is your wrench. How can you return to your ship?
Fill in the blank(s) with the appropriate word(s).
If Venus once had an ocean, where did it go?
A) It exists as abundant water vapor in the planet's atmosphere. B) It was lost to space, stripped away by the solar wind. C) The water broke into hydrogen, which escaped to space, and oxygen, which became trapped in the planet's surface rocks. D) It exists trapped in the crust but below the surface. E) It is found in the cooler polar regions, like at the Moon and Mercury.
What is bought from an electric company?
a. Electrical energy b. Electric charge c. Electrical power d. None of these
A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same. b. increases. c. decreases. d. doubles every 4.0 seconds.