reconhecer que o som é produzido por vibraçoes de um material (fonte sonora) e identificar fontes sonoras

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Sound travels slower in colder air that it does in warmer air. make a claim about the effect of air temperature on the speed of sound. support your claim with evidence