Ellen says that whenever the acceleration is directly proportional to the displacement of an object from its equilibrium position, the motion of the object is simple harmonic motion. Mary says this is true only if the acceleration is opposite in direction to the displacement. Which one, if either, is correct?
a. Ellen, because w2 is directly proportional to the constant multiplying the displacement and to the mass.
b. Ellen, because w2 is directly proportional to the mass.
c. Mary, because w2 is directly proportional to the constant multiplying the displacement and to the mass.
d. Mary, because w2 is directly proportional to the mass.
e. Mary, because the second derivative of an oscillatory function like sin(wt) or cos(wt) is always proportional to the negative of the original function.
E
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A. 28°C B. 32°C C. 31°C D. 33°C E. 35°C
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A. smaller. B. zero. C. larger.
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A) 4t. B) 2t. C) t . D) t/ . E) t/2.
An object is placed 10 cm to the left of a converging spherical lens. The lens has a focal length of f = 5 cm. Where is the image formed?
a. 3.3 cm to the left of the lens b. 3.3 cm to the right of the lens c. 10 cm to the left of the lens d. 10 cm to the right of the lens