A plane is moving due north, directly towards its destination. Its airspeed is 210 mph. A constant breeze is blowing from west to east at 20.0 mph. At what rate is the plane moving north?
a. 209 mph
b. 211 mph
c. 204 mph
d. 199 mph
e. 194 mph
a
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A sealed container holds 0.020 moles of nitrogen (N2 ) gas, at a pressure of 1.5 atmospheres and a temperature of 290 K. The atomic mass of nitrogen is 14.0 g/mol
The Boltzmann constant is 1.38 × 10-23 J/K and the ideal gas constant is R = 8.314 J/mol • K = 0.0821 L • atm/mol • K. The mass density of the gas is closest to A) 0.90 kg/m3. B) 1.3 kg/m3. C) 1.8 kg/m3. D) 2.2 kg/m3. E) 2.6 kg/m3.
Unlike the refracting astronomical telescope discussed in the text that gives an inverted image, Galileo's telescope produced an upright image. What did he do differently to accomplish this?
a. He rotated the barrel of the telescope 180°. b. He used diverging lenses for both the eyepiece and the objective. c. He used a diverging lens for the eyepiece. d. He used a diverging lens for the objective.
The turntable of a record player has an angular velocity of 8.0 rad/s when it is turned off. The turntable comes to rest 2.5 s after being turned off. Through how many radians does the turntable rotate after being turned off? Assume constant angular acceleration
a. 12 rad b. 8.0 rad c. 10 rad d. 16 rad e. 6.8 rad
The Hubble time only describes a Universe that is ____
a. flat b. totally open c. totally closed d. partially open e. partially closed