Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hz sound in air is
A) four times as long.
B) twice as long.
C) the same.
D) one-half as long.
E) none of the above
B
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Using the scale in the diagram below, what is the diameter of Mercury?
a.
about 240 km
b.
about 2400 km
c.
about 24,000 km
d.
about 240,000 km
e.
about 2.4 × 106 km
First Law of Thermodynamics: A cylinder contains 10 moles of an ideal gas at a temperature of 300 K. The gas is compressed at constant pressure until the final volume equals 0.77 times the initial volume. The molar heat capacity at constant volume of the gas is 24.0 J/mol ? K and R = 8.31 J/mol ? K . How much heat is absorbed by the gas during this process? (R = 8.31 J/mol ? K)
A. -22 kJ B. -17 kJ C. 22 kJ D. 17 kJ E. -5.7 kJ
In a perfectly inelastic one-dimensional collision between two objects, what condition alone is necessary so that all of the original kinetic energy of the system is gone after the collision?
1.The objects must have momenta with the same magnitude but opposite directions. 2.The objects must have the same mass. 3.The objects must have the same velocity. 4.The objects must have the same speed, with velocity vectors in opposite directions.
The shear velocity in the 60-mm-diameter horizontal water pipe of Problem 2 is nearest:
(A) 0.031 m/s (B) 0.024 m/s (C) 0.019 m/s (D) 0.017 m/s