What is the resultant sound level when an 81-db sound and an 87-db sound are heard simultaneously ?.

The differences between  a compression wave and a transverse wave?

Ineed asap! list 3 examples in which friction us or makes things easier in our daily life. explain the effect of friction for each. *make sure you explain the effect of friction for each example! *

*drag each tile to the correct location in the sequence* the table shows chronological events in the life of our sun, a medium-sized star. place the missing events into the correct rows of the table.