A compound is a stable chemical substance composed of two or more ________.
Fill in the blank(s) with the appropriate word(s).
elements
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The frequency of a flood event and its magnitude is known as
What will be an ideal response?
A high-voltage transmission line carries 1 000 A at 700 kV for a distance of 200 miles. If the resistance in the wire is 1 ?/mile, what is the power loss due to resistive losses?
a. 20 kW b. 200 kW c. 20 MW d. 200 MW e. 200 W
What is an alpha particle?
a. A hydrogen atom. b. A helium atom. c. A hydrogen atom without its electrons (and therefore having one unit of positive charge). d. A helium atom without its electrons (and therefore having two units of positive charge). e. A deuterium nucleus (with one proton and one neutron).
When a light beam enters glass from air the beam is refracted. Why does this happen? (Hint: What physical property of the light changes?)