Three identical 6.0-kg cubes are placed on a horizontal frictionless surface in contact with one another. The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 3.0 m/s2 . What is the magnitude of the force exerted on the middle cube by the left cube in this case?
a. 18 N
c. 54 N
b. 27 N
d. none of the above
D
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Which of the following is not involved in the formation of a rainbow?
a. interference b. dispersion c. internal reflection d. refraction
Bulk Modulus: Two solid spheres are made from the same material, but one has twice the diameter of the other. Which sphere will have the greater bulk modulus?
A. the larger one B. the smaller one C. It will be the same for both spheres.
The Milky Way Galaxy is
a. a spiral galaxy. b. part of a cluster of galaxies that contains a few dozen galaxies. c. about 80,000 light years in diameter. d. All of the other choices are correct.
First Law of Thermodynamics: An expansion process on an ideal diatomic ideal gas for which CV = 5/2 R has a linear path between the initial and final coordinates on a pV diagram. The coordinates of the initial state are: the pressure is 300 kPa, the volume is 0.030 m3, and the temperature is 390 K. The final pressure is 150 kPa and the final temperature is 340 K. What is the change in the internal (thermal) energy of the gas, during this process? (R = 8.31 J/mol ? K)
A. -2900 J B. -1700 J C. 2900 J D. 1700 J E. 0 J