What is the velocity of a wave with a frequency of 6.5 Hz (waves/sec) and a wavelength of 0.20 m/wave?​

An equinox occurs when a. neither end of earth's axis is tilted toward or away from the sun. b. the north end of earth's axis is tilted away from the sun. c. the north end of earth's axis is tilted toward the sun. d. earth's axis is parallel to the sun's rays. select the best answer from the choices provided a b c d

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Can a molecule have bond dipoles but not have a molecular dipole?