The solar nebular theory has been supported by observation of dusty disks around the ________ of young, condensing stars
Fill in the blank(s) with correct word
equators
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Current: When a current flows through a metal wire, the moving charges are
A. only protons. B. only electrons. C. both protons and electrons. D. positive metal ions. E. negative metal ions.
Deuterium abundance suggests that normal matter makes up only 3-4% of the critical density
Indicate whether the statement is true or false
Equipotentials are lines along which
a. the electric field is constant in magnitude and direction. b. the electric charge is constant in magnitude and direction. c. maximum work against electrical forces is required to move a charge at constant speed. d. a charge may be moved at constant speed without work against electrical forces. e. charges move by themselves.
Engines, including car engines, are rated in horsepower. What is horsepower?
(a) The force needed to start the engine. (b) The force needed to keep the engine running at a steady rate. (c) The energy the engine needs to obtain from gasoline or some other source. (d) The rate at which the engine can do work. (e) The amount of work the engine can perform