In a circuit powered by a battery it is correct to say that electrons flow
A) from the battery and into the circuit.
B) from the negative terminal to the positive terminal of the battery.
C) through both the battery and the devices making up the circuit.
D) none of the above
Answer: C
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Acceleration: A racquetball strikes a wall with a speed of 30 m/s and rebounds in the opposite direction with a speed of 26 m/s. The collision takes 20 ms. What is the average acceleration of the ball during the collision with the wall?
A. 0 m/s2 B. 200 m/s2 C. 2800 m/s2 D. 1500 m/s2 E. 1300 m/s2
From Kepler's ________ law, we conclude that the planets do not move with constant speed.
A. First B. Second C. Third D. Fourth
CH3COOH is the structural formula for the compound named ______________
Fill in the blank(s) with correct word
Two radioactive isotopes, X and Y, both decay to stable products. The half-life of X is about a day, while that of Y is about a week
Suppose a radioactive sample consists of a mixture of these two nuclides. If the mixture is such that the activities arising from X and Y are initially equal, then a few days later the activity of the sample will be due A) predominantly to Y. B) to X and Y equally. C) predominantly to X. D) entirely to Y.