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

Physics & Space Science

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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?

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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.


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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.

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Atmosphere pressure on mars is roughly half that of Earth's at sea level

Indicate whether the statement is true or false.

Physics & Space Science