A light-year is:

a. the distance light travels in one year

b. about 19 trillion miles

c. based on the distance from the earth to the sun

d. all of the above

Which city had many deaths from smog in 1952

People are able to hear footsteps because the sound made by a foot hitting the floor travels through the air to reach their ears. is this absorption or transmission

A tsunami is a large wave that is caused by

g An object spins in place with no unbalanced forces or torques acting upon it, what do we expect this object to do? The object's spin will slow and eventually reverse direction. The object will continue spinning as it has been.

Which statement best describes why the universe could be considered an isolated system?

Which of the following explains what is meant by the statement "scientific knowledge is universal"? The rules cannot be determined. The rules only apply in certain parts of the universe. The rules depend on experiments from different countries.

The force of friction on a sliding object is 10n. the applied force needed to maintain a constant velocity is:

Which of the following methods of improving air quality does not require advanced technology?

When two waves with the same amplitude overlap so that a crest lines up with a trough, the resulting wave ...

Suppose the Sun suddenly stopped emitting light. How long would it take, in seconds, for the Sun's light to disappear on Earth? (Hint: The Sun is an average of 150 million km from Earth).