Determine the value of a and K when 0.51 is written is scientific nation​

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

A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant

Humidity is to blame for that muggy, steamy feeling you experience on some hot summer days. what gas in the atmosphere causes humidity? a) oxygen b) hydrogen c) nitrogen d) water vapor