Atrain travels 83 kilometers in 2 hours, and then 79 kilometers in 2 hours. what is its average speed?

Classify each possible hypothesis about a medicinal aloe vera plant as falsifiable or non-falsifiable. aloe vera gel is the best natural skin moisturizer. aloe vera gel can heal wounds by boosting cell renewal. aloe vera juice tastes better than carrot juice. drinking aloe juice can reduce the risk of lung cancer.

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

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?