Kirchhoff's Rules: Kirchhoff's junction rule is a statement of
A. the law of conservation of momentum.
B. the law of conservation of charge.
C. the law of conservation of energy.
D. the law of conservation of angular momentum.
E. Newton's second law.
Answer: B
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The above figure is an example of a vector image.
Answer the following statement true (T) or false (F)
The reason an astronaut in an earth satellite feels weightless is that
A) the astronaut is beyond the range of the earth's gravity. B) the astronaut is falling. C) the astronaut is at a point in space where the effects of the moon's gravity and the earth's gravity cancel. D) this is a psychological effect associated with rapid motion. E) the astronaut's acceleration is zero.
A quantity that is capable of producing motion or a change in motion is called a(n) ______________
Fill in the blank(s) with correct word
You stand by the railroad tracks as a train passes by. You hear a 950-Hz frequency when the train approaches, which changes to 820 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 14.0 m/s c. 25.0 m/s b. 20.0 m/s d. 37.8 m/s