If the scalar (dot) product of two vectors is negative, it means that
a.
there was a calculator error.
b.
the angle between the vectors is less than 90 degrees.
c.
the angle between the vectors is 90 degrees.
d.
the angle between the vectors is greater than 270 degrees.
e.
the angle between the vectors is between 90 and 180 degrees.
e
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Where did the molecular oxygen in Earth's atmosphere come from?
A) photosynthesis by living organisms B) the breakdown of water molecules by sunlight C) outgassing from volcanoes D) evaporation from the oceans E) chemical reactions with surface rocks
________ range in wavelength from millimeters to hundreds of meters.
A. Ultraviolet waves B. Gamma rays C. Visible light waves D. X-rays E. Radio waves
You and I are emitting primarily
A) X-ray radiation. B) infrared radiation. C) visual radiation. D) radio radiation.
Which of the following statements is correct about the experiment that first measured the charge of the electron?