Sounds are affected by ... and ... A. frequency , vibrations
B. temperature, determines
C. sonar, ultrasound
D. noise, vibrations​

What do you think car designers do if the damage caused by a crash test is too severe?

Agroup of monkeys is trying to cross the river in a rowboat. the maximum buoyant force on the rowboat is 2,000 n. the weight of the rowboat is 1,000 n. each monkey has a weight of 150 n. how many monkeys can safely cross in the rowboat at one time? explain your reasoning, including any calculations you used to find the answer.

Ascientist wants to test ways to reduce pollution in lake . what is the bestway of doing this