The internal energy of n moles of an ideal gas depends on

a. one state variable T.
b. two state variables T and V.
c. two state variables T and P.
d. three state variables T, P and V.
e. four variables R, T, P and V.


a

Physics & Space Science

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Energy flows by radiation or convection inside stars but almost never by conduction

Indicate whether the statement is true or false

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The circuit below contains three resistors, A, B, and C, which all have equal resistances. The emf ? = 110V. Which resistor generates the most thermal energy after the switch is closed?



a.
A

b.
B

c.
C

d.
A and B

e.
All three generate equal amounts of thermal energy.

Physics & Space Science

Which of the following is an expected consequence of global warming?

A) more extreme weather events, including extreme winter storms B) ocean water becoming more acidic C) an increase in sea level D) reduced ice coverage in the Arctic Ocean E) All of the above are expected consequences of global warming.

Physics & Space Science

According to Einstein, is a frame at rest on the earth’s surface a reasonably accurate inertial frame (ignoring the earth’s rotation)?

A. No, such a frame is accelerating upward. B. It is not a real inertial frame, but we can treat it as one if we ignore external gravitational forces acting on objects inside the frame. C. Yes. D. It depends (explain).

Physics & Space Science