In a 2-dimensional Cartesian coordinate system the y component of a given vector is equal to that vector's magnitude multiplied by which trigonometric function, with respect to the angle between vector and x axis?
a. sine
c. tangent
b. cosine
d. cotangent
A
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A light bulb is in front of a converging lens, creating a well-focused image of the light bulb on the screen on the opposite side of the lens. If the light is moved farther from the lens, how can the screen be adjusted to keep the image in focus?
A. The screen should be moved further from the lens. B. The screen should be made larger, but in the same place. C. The screen should be moved closer to the lens. D. No changes need to be made to the screen.
Which of these evolutionary paths is the fate of our Sun?
A) nova B) supernova of Type II C) planetary nebula D) supernova of Type I E) brown dwarf
A ceramic mixture
Which of the following explains why the Sun appears to move gradually eastward along the path called the ecliptic on the celestial sphere?
A) Earth rotates once each day. B) Earth orbits the Sun once each year. C) The direction of Earth's axis in space precesses with a period of about 26,000 years. D) Stars appear to move randomly relative to our Sun in the local solar neighborhood. E) The universe is expanding.