What is the troposphere?
A) the lowest layer in the atmosphere
B) the part of the atmosphere that absorbs optical light
C) the part of the atmosphere that absorbs ultraviolet
D) the part of the atmosphere that absorbs X-rays
E) the highest layer in the atmosphere
A
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Answer the following statement(s) true (T) or false (F)
1. Consider the electric field shown below:
This is a physically possible static electric field (that is, we can calculate a well-defined potential difference between any two points in this field).
2. Consider the electric field shown below:
(This hypothetical field is uniform to the left of the boundary shown and zero to the right of that boundary.) This is a physically possible static electric field (that is, we can calculate a well-defined potential difference between any two points in this field)
Wave Characteristics: An electromagnetic wave is propagating towards the west in free space. At a certain moment the direction of the magnetic field vector associated with this wave points vertically upward. What is the direction of the electric field vector?
A. horizontal and pointing south B. vertical and pointing down C. horizontal and pointing north D. vertical and pointing upward E. horizontal and pointing east
A cylindrical wire has a resistance R and resistivity ?. If its length and diameter are BOTH cut in half,
(a) what will be its resistance? A) 4R B) 2R C) R D) R/2 E) R/4 (b) what will be its resistivity? A) 4? B) 2? C) ? D) ?/2 E) ?/4 What will be an ideal response?
In grinding a steel knife blade (specific heat = 0.11 cal/g-C°), the metal can get as hot as 400.°C. If the blade has a mass of 80. g,
what is the minimum amount of water needed at 20°C if the water is not to rise above the boiling point when the hot blade is quenched in it?