When a force acts in a direction opposite to the motion, ________ work is said to be done on the object.
Fill in the blank(s) with the appropriate word(s).
negative
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Why is a global magnetic field thought to be necessary for life to exist on the surface of a planet?
A) A magnetic field shields the planet from harmful ultraviolet light. B) A magnetic field helps form ozone in the upper atmosphere. C) A magnetic field helps keep the planet's atmosphere from being stripped away by stellar winds. D) A magnetic field helps warm the planet's surface through the greenhouse effect.
________ form when galaxies collide and ________.
A. Quasars; emit large amounts of heat and radio waves B. Starburst galaxies; star formation is triggered, making them very bright C. S0 galaxies; all their stars are destroyed D. Starburst galaxies; all their stars are destroyed
The decoupling of the strong force from the electroweak force provided energy for a rapid inflation of the Universe
a. True b. False Indicate whether the statement is true or false
In which binary system can we observe both the stars separately and follow their orbits around each other?
A. eclipsing binary system B. visual binary system C. spectroscopic binary system D. transiting binary system