The ideal shape for the primary mirror of a telescope is

a. concave circular
b. convex circular
c. concave parabolic
d. convex parabolic
e. plane


C

Physics & Space Science

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If all of the asteroids in the solar system were gathered into a single object, how big would it be once gravity compressed it?

A) about half the diameter of Earth's Moon B) about the size of Earth's Moon C) about the size of the Earth D) about the size of a Neptune

Physics & Space Science

A star approaching Earth will show spectral lines that are shifted to longer wavelengths.

Answer the following statement true (T) or false (F)

Physics & Space Science

What led Kepler to abandon circular orbits and his discovery that planetary orbits are ellipses?

A) a deviation between observed and model values that was much larger than the observation uncertainties B) a desire to gain prestige by using a more complicated model C) the observation of a comet moving on a highly eccentric orbit

Physics & Space Science

Imagine that we have a liquid with a density of 3.5 g/cm3. Knowing that objects of higher density will sink in the liquid, will a piece of quartz sink or float in the liquid?

What will be an ideal response?

Physics & Space Science