What are the physical characteristics of sound waves

Astone is dropped with no initial velocity from the top of a cliff and hits the ground a time of 3.9 s later. what is the height of the cliff, in units of meters? you may assume that air resistance is negligible. give the answer as a positive number question 15 a figure skater is rotating at a rate of 200 revolutions per minute. what is the angular speed, in units of rad/s? 200 o 20.9 12000 o 3.33

Which accounts for an increase in the temperature of a gas that is kept a constant volume

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