Which type of wave can travel through empty space?
seismic waves
mechanical waves
sound waves
light waves

An object is 10. cm from the mirror, its height is 3.0 cm, and the focal length is 2.0 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1.33 -1.33 +0.75 -0.75

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2