The speed of sound V near the Earth's surface can be represented by this equation,v=20√t+273 , where t is the temperature in degrees Celsius. Find the temperature when V = 380 meters per second. Round to the nearest whole number.
A. 88
B. 90
C. 92
D. 94

Question

The speed of sound V near the Earth's surface can be represented by this equation,v=20√t+273 , where t is the temperature in degrees Celsius. Find the temperature when V = 380 meters per second. Round to the nearest whole number.
	A.	88
	B.	90
	C.	92
	D.	94

dumbcow · Answer

none of those are right...it should be close to 30

anonymous · Answer

$$380=20\sqrt{t+273} \implies 19^2=t+273 \implies t=88$$

anonymous · Answer

The notation of the problem statement wasn't exactly as clear as it might have been, but amazing as it might seem, I remembered that formula from an aeronautical engineering class about a lifetime ago.