A plane has an airspeed of 142 m/s. A 16 m/s wind is blowing southward at the same time as the plane is flying. If the velocity of the plane relative to the ground is directly eastward, what is the magnitude of that velocity?
A) 141 m/s B) 160 m/s C) 130 m/s D) 16 m/s E) 48 m/s
A
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A) rich galaxy cluster B) poor galaxy cluster C) regular galaxy cluster D) spherical galaxy cluster
Photons of light can be absorbed by an atom of an element ____
a. if they match one of several possible wavelengths that are absorbed by that element b. if they match one of several possible wavelengths that are absorbed by all elements c. if they match the only particular wavelength that can be absorbed by that element d. if they match the only particular wavelength that can be absorbed by all elements e. no matter what wavelength they have
A proton consists of 3 quarks, two with charge +2e/3 and one with charge –e/3 . Of the following, which is closest to the approximate potential energy of the arrangement of the two positive quarks if they are separated by 10–15 m?
a. 1 MeV c. 1012 MeV b. 10–19 MeV d. 100 MeV
A phase difference of 480° corresponds to what wavelength difference?
a. 3l c. 3l/4 b. 3l/2 d. 4l/3