Current: What current is flowing in a resistor if 4.0 × 1016 electrons pass a point in the resistor in 0.50 s? (e = 1.60 × 10-19 C)
A. 0.013 A
B. 0.31 A
C. 6.3 A
D. 78 A
Answer: A
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Convection in the outer layers of a star like the Sun helps mixing and makes more hydrogen available for burning.
Answer the following statement true (T) or false (F)
The accelerating force of the wind on a small 300-kg sailboat is 780 N northeast. If the drag of the keel is 552 N acting west, what is the acceleration of the boat?
a. 4.4 m/s2 due east b. 1.8 m/s2 due north c. 2.6 m/s2 northeast d. 3.2 m/s2 north by northwest e. 0.23 m/s2 due east
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.
If two mirrors are at a right (90°) angle to one another and an object is placed between them:
a. only one of them reflects the object; the other one only reflects reflections of the object. b. there is only a single image of the object in each mirror. c. they both show the exact same thing. d. they each show exactly three reflections. e. they each show an infinite series of reflections.