Suppose XL > XC. If switch A is closed in the figure below, what happens to the phase angle?
1
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Kepler's second law is about the speed of planets, where planets move faster at perihelion and slower at aphelion
a. True b. False Indicate whether the statement is true or false
Concerning dark energy, we do know:
A) that it is created when matter annihilates anti-matter. B) its density remains constant over time, so it is not important in the early Universe. C) combined with dark matter, it will ultimately produce a closed universe. D) that it was revealed with Type II supernovae distances in the late 1990s. E) that it makes up 90% of all the matter and energy in the whole universe.
What do we mean when we say that the universe is expanding?
A) Average distances between galaxies are increasing with time. B) Within galaxies, average distances between star systems are increasing with time. C) Everything in the universe is gradually growing in size. D) The statement is not meant to be literal; rather, it means that our knowledge of the universe is growing.
Consider a situation where you exert a force F on a crate of mass m, moving it at a speed v a distance d across a floor in a time interval t. The quantity Fd/t is
a. the kinetic energy of the crate b. the potential energy of the crate c. the linear momentum of the crate d. the work you do on the crate e. the power you supply to the crate