The three phases of matter can exist together in equilibrium at the
A)
critical point.
B)
triple point.
C)
melting point.
D)
boiling point.
E)
evaporation point.
B
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A transverse periodic wave is represented by the equation z(y, t) = 1.50 cm sin(1,250 rad/s t + 10.0
What is the direction of the vibration of the wave?
A. the x direction B. the y direction C. the z direction
An ice dancer with her arms stretched out starts into a spin with an angular velocity of 1.00 rad/s. Her moment of inertia with her arms stretched out is 2.48 kg 
What is her angular velocity when she pulls in her arms to make her moment of inertia 1.40 kg 
?
A. 2.67 rad/s B. 2.45 rad/s C. 2.03 rad/s D. 1.90 rad/s E. 1.77 rad/s
Which of the following statements is not an assumption used in models of galaxy formation?
A) The very early universe had an almost perfectly uniform distribution of hydrogen and helium gas. B) Some regions in the universe were slightly more dense than others. C) The universe is expanding. D) Gas contracted to form the disks of galaxies before any stars were born.
For the wave described by y = 0.02 sin (kx) at t = 0 s, the first maximum at a positive x coordinate occurs where x = 4 m. Where on the positive x axis does the second maximum occur?
a. 20 m b. 18 m c. 24 m d. 28 m e. 16 m