When the bottom string is pulled slowly in the heavy-ball-and-strings demonstration (Figure 1.7 in your text), tension

A) in the top string is due to your pull plus the weight of the ball.
B) is about the same in both strings.
C) in the bottom string is zero.
D) none of the above


Answer: A

Physics & Space Science

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You are standing on a platform and a train approaches you, moving at a constant velocity. Its whistle is blowing continuously. The train does not stop at the platform, but it continues to move past the platform at a constant velocity. Which of the following statements are true about the frequency of the train's whistle that you hear?

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If an electron is accelerated through a potential difference of 500 V between two parallel plates separated by a distance of 2.0 cm. The change in kinetic energy of the electron during this motion is

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Physics & Space Science