A 75-kg swimmer dives horizontally off a 250-kg raft initially at rest. If the diver's speed immediately after leaving the raft is 2 m/s, what is the corresponding raft speed?
a. 0.2 m/s
c. 0.6 m/s
b. 0.3 m/s
d. 4.0 m/s
Question 2
Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result?
a. One object is negatively charged and the other is uncharged. b. One object is positively charged and the other is uncharged. c. One object is positively charged and the other is negatively charge.
d. All of the above could result in such attraction.
A photograph of Commodore Matthew Perry in 1855 juxtaposed with a Japanese portrait of him. When Per
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Speed of Light in Different Mediums
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