What is the term that describes waves that require a medium through which to travel?

Which statements about tornadoes are true? check all that apply. (a) about 12,000 tornadoes hit the united states every year. (b) a tornado looks like a funnel. (c) tornadoes are deadly atmospheric storms that cause millions in damages each year. (d) tornadoes can reach wind speeds of more than 300 miles per hour. (e) kansas is the state with the most tornadoes. (f) you will always notice a funnel before a tornado strikes.

How is sound energy produced a. vibrating objects b. objects being heated c. temperature differences d. stationary objects

Which of the following statements accurately describes the sign of the work done on the box by the force of the push? a. positive b. negative c. zero