At the first maxima on either side of the central bright spot in a double-slit experiment, light from each opening arrives
A) in phase.
B) 90° out of phase.
C) 180° out of phase.
D) 45° out of phase.
E) -45° out of phase.
A
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Two metal rods are made of the same material and have the same cross-sectional area. The two rods differ only in their lengths which we call L and 3L, respectively
You heat the two rods from the same initial temperature to the same final temperature. You observe that the short rod expands its length by an amount ?L. The amount by which the length of the long rod will expand must be A) ?L. B) ?L. C) 2?L. D) 3?L. E) 9?L.
Heating the air in a hot air balloon reduces the air's _________
Fill in the blank(s) with correct word
Two objects with indices of refraction n1 and n2 are placed in the same liquid substance and have their critical angles measured. If experiment shows that ?c1 > ?c2, then it must also be true that
1. n1 < n2. 2. n1 > n2. 3. n1 = n2. 4.more must be known to determine the relationship between n1 and n2.
A 1.1kg seagull takes off from a piling along the California coast and accelerates within 0.50s to a flight speed of 7.5m/s along a horizontal path. What average power was developed by the bird’s wings as it accelerated?
A. 62W B. 8.3W C. 33W D. 250W