Acceleration: An airplane increases its speed at the average rate of 15 m/s2. How much time does it take to increase its speed from 100 m/s to 160 m/s?
A. 17 s
B. 0.058 s
C. 4.0 s
D. 0.25 s
Answer: C
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a. true b. false
At 20°C an aluminum ring has an inner diameter of 5.000 cm, and a brass rod has a diameter of 5.020 cm. Keeping the brass rod at 20°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (aAl = 2.4 × 10^-5 /°C, abrass = 1.9 × 10^-5/°C )
a. 111°C c. 228°C b. 187°C d. 437°C
The pressure drop in a tube carrying a viscous fluid is described by
A) Bernoulli's principle. B) Pascal's principle. C) Archimedes' principle. D) Poiseuille's equation. E) Newton's Second law.
A shock wave is produced when a wave source moves
A) nearly as fast as the waves it produces. B) as fast as the waves it produces. C) faster than the waves it produces. D) none of the above