What prevents the pressure from increasing as a cloud contracts due to its gravity?
A) As the cloud becomes denser, gravity becomes stronger and overcomes the pressure buildup.
B) The pressure is transferred from the center of the cloud to its outer edges where it can dissipate.
C) Thermal energy is converted to radiative energy via molecular collisions and released as photons.
D) Excess pressure is released in jets of material from the young stars.
E) Once the cloud reaches a critical density, the pressure becomes degenerate and independent of temperature.
C
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A conducting bar moves as shown near a long wire carrying a constant 80-A current. If a = 1.0 mm, b = 20 mm, and v = 5.0 m/s, what is the potential difference, Va ? Vb?
a.
?0.24 mV
b.
+0.24 mV
c.
?0.19 mV
d.
+0.19 mV
e.
?0.76 mV
What is the resolution of a telescope?
A) Its ability to see very faint objects B) Its ability to distinguish two adjacent objects close together in the sky C) Its ability to make distant objects appear much closer to us D) Its ability to separate light into its component colors for analysis E) Its ability to focus more than just visible light for imaging
What type of igneous formation would agree with the principle of superposition?
What will be an ideal response?
Which of the items below is electromagnetic radiation?
a. gamma rays
b. X-rays
c. visible light
d. radio
e. All of the other choices are correct.