A rock is rolled in the sand. It starts at 5.0 m/s, moves in a straight line for a distance of 6.0 m, and then stops. What is the magnitude of the average acceleration?
a. 2.1 m/s2 b. 4.2 m/s2
c. 5.4 m/s2 d. 6.2 m/s2
a
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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 ?2 is directly proportional to the constant multiplying the displacement and to the mass. b. Ellen, because ?2 is directly proportional to the mass. c. Mary, because ?2 is directly proportional to the constant multiplying the displacement and to the mass. d. Mary, because ?2 is directly proportional to the mass. e. Mary, because the second derivative of an oscillatory function like sin(?t) or cos(?t) is always proportional to the negative of the original function.
Using the Rayleigh criterion, one concludes that using fixed wavelength light that it is not possible to resolve details less than about
A) 0.5 wavelength. B) 0.1 wavelength. C) one wavelength. D) 10 wavelengths. E) 122 wavelengths.
The absence of a magnetic field on Venus probably stems from its:
A) nearness to the Sun. B) extremely thick atmosphere. C) slow rotation. D) high surface temperatures. E) lower density than Earth, suggesting an absence of an iron core.
The 400" Keck reflector can see objects 100 times fainter than the 40" Yerkes lens
Indicate whether the statement is true or false