Phineas and Ferb build a flying machine. They accelerate into the air in a straight line, going from 0 m/s to 30 m/s in 3 s. Find their average
acceleration.

Disinfection of impression materials is usually accomplished by a. sterilization with high heat. b. spray or immersion in a chemical disinfectant. c. sterilization with steam under pressure. d. allowing the impression to sit 24 hours in water until all the organisms die.

Identify the various levels of atmosphere. troposphere mesosphere exosphere stratosphere thermosphere

How can you tell the difference between rough er from smooth er?