Where, do you feel, is the greatest possible source of error in this experiment? Why?
The greatest possible source of error is the measurement of the final temperature of
the mixture because the process of mixing the two substances evenly is difficult to
accomplish.
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Which of the following statements correctly describes the law of conservation of energy?
A) An object always has the same amount of energy. B) Energy can change between many different forms, such as potential, kinetic, and thermal, but it is ultimately destroyed. C) Energy can change between many different forms, such as potential, kinetic, and thermal, but the total quantity of energy in the universe never changes. D) The fact that you can fuse hydrogen into helium to produce energy means that helium can be turned into hydrogen to produce energy. E) It is not really possible for an object to gain or lose potential energy because energy cannot be destroyed.
Starting outside the region with the magnetic field, a single square coil of wire enters, moves across, and then leaves the region with a uniform magnetic field 
perpendicular to the page so that the graph shown below represents the induced emf. The loop moves at constant velocity 
. As seen from
above, a counterclockwise emf is regarded as positive. In which direction did the loop move over the plane of the page?
?
?
A. The loop moved from bottom to top.
B. The loop moved from top to bottom.
C. The loop moved from left to right.
D. The loop moved from right to left.
E. All of these directions of motion will produce the graph of emf vs t.
A piece of iron heated to 200 degrees Celsius has twice as much internal energy as a piece of iron at 100 degrees Celsius.
Answer the following statement true (T) or false (F)
What is the origin of synchrotron radiation in radio galaxies?
A. neutron stars at the center of the radio galaxy B. supernova explosions C. radiation from a massive black hole at the center of the galaxy D. high-speed electrons spiraling around the magnetic field lines E. hydrogen gas