X-ray telescope mirrors are very similar to optical telescope mirrors
Indicate whether the statement is true or false
FALSE
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A celebrating student throws a water balloon horizontally from a dormitory window that is 50 m above the ground. It hits the ground at a point 60 m from the building. Ignore air
(a) What will be the horizontal component of the velocity of the balloon just before it hits the ground? (b) What will be the magnitude of the vertical velocity of the balloon just before it hits the ground?
On the H-R diagram, lines of constant radius are illustrated as _____
a. sloping downward from right to left b. sloping downward from left to right c. running vertically on the right side d. running horizontally on the top e. moving in various direction depending on the type of star
The spectra of different elements can be distinguished because
a. they have the same spectral lines, but the lines are of different intensities. b. they have spectral lines in different positions. c. every element has one unique spectral line. d. none of the above
Parallel rays of light that hit a concave mirror will come together:
a. at the focal point. b. at a point half way to the focal point. c. at infinity. d. at the center of curvature.