In constructing a thermometer it is NECESSARY to use a substance that:
A. expands with rising temperature
B. expands linearly with rising temperature
C. will not freeze
D. will not boil
E. undergoes some change when heated or cooled
Answer: E. undergoes some change when heated or cooled
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Graphical Analysis: A child standing on a bridge throws a rock straight down. The rock leaves the child's hand at time t = 0 s. If we take upward as the positive direction, which of the graphs shown below best represents the velocity of the stone as a function of time?
A. 
B. 
C. 
D. 
E. 
Diagram below shows a hypothetical magnetic field in a certain region of empty space where the electric field is constant in time. 
Which of the fields are physically impossible and why?
A. This field violates the Ampere-Maxwell law. B. This field violates Gauss’s law for the magnetic field. C. The field violates both of the above laws. D. This field is physically possible.
Atmosphere pressure on mars is roughly half that of Earth's at sea level
Indicate whether the statement is true or false.
If 1.0 m3 of concrete weighs 5 × 104 N, what is the height of the tallest cylindrical concrete pillar that will not collapse under its own weight? (The compression strength of concrete is 1.7 × 107 N/m2.)
What will be an ideal response?