Answer:It isn’t
Explanation:
Air isn't considered a pure substance because there is no one single chemical element of compound that forms air. Air is a mixture of various pure chemical substances, most of which exist in the gaseous state.
968 j or kg because it cannot lose any of it energy and cannot gain any extra mass from nothing
Answer:
109ohm
Explanation:
Note: when resistors are connected in series
Rt = R1 + R2 + R3 = 23+81+5 = 109ohm
Explanation:
Below is an attachment containing the solution.