In relativity, two people share the same reference frame only if what is true?
A) They are not moving relative to one another.
B) They are both located in the same place.
C) They are both located in the same place and are stationary.
D) They agree on the laws of nature.
A
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Sketch five isotherms and appropriate heat flow lines for heat transfer per unit depth through a 5 cm x 5 cm square where the heat flow is from a high temperature corner and another isothermal as the side of the square.
What will be an ideal response?
Spherical Mirrors: Which statements about images are correct? (There could be more than one correct choice.)
A. A virtual image cannot be formed on a screen. B. A virtual image cannot be viewed by the unaided eye. C. A virtual image cannot be photographed. D. A real image must be erect. E. Mirrors always produce real images because they reflect light.
We know interstellar matter exits because
A. the matter creates narrow absorption lines in the spectra of some stars. B. we can see it in dark clouds and clouds that absorb light. C. we can detect radio waves coming from atoms and molecules in the cold gas. D. some stars appear red in color despite their temperature. E. All of these choices are correct.
Unbound orbits have more orbital energy than bound orbits
Indicate whether the statement is true or false