An un-stretched hanging spring is 50 cm long. Suspending a 100-N block from it increases its length to 60 cm. Adding another 100-N block makes the spring's length
A) 60 cm.
B) 70 cm.
C) 80 cm.
D) 100 cm.
E) 120 cm.
Answer: B
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Consider a vibrating guitar string that makes a sound wave that moves through the air. As the string moves up and down, the air molecules that are a certain horizontal distance from the string will move:
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A pendulum 3.0 m long is oscillating through a maximum angle of 4.8°. What is its speed when the angle is 2.4°?
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