A bomb blast sends a shock wave through the 20°C atmosphere. At a certain location, the shock wave is travelling at M = 3. The induced velocity behind the wave is nearest:
(A) 760 m/s
(B) 620 m/s
(C) 540 m/s
(D) 410 m/s
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What is the net force on a 10-kg solid steel sphere falling in air at terminal speed?
a. 980 N b. 200 N c. 98 N d. 49 N e. Some value other than those given above.
Consider an RLC series circuit. The impedance of the circuit increases if XC increases
A) true only if XL is greater than or equal to XC B) true only if XL is less than or equal to XC C) always true D) never true
Four identical point charges (+4.0 ?C) are placed at the corners of a square which has 20-cm sides. How much work is required to assemble this charge arrangement starting with each of the charges a very large distance from any of the other charges?
a. +2.9 J b. +3.9 J c. +2.2 J d. +4.3 J e. +1.9 J
Emission nebulae like M42 occur only near stars that emit large amounts of
A) infrared heat. B) X-rays and gamma rays. C) microwaves. D) ultraviolet radiation. E) visible light.