Which reflector telescope would be the easiest to construct, and why?
What will be an ideal response?
The prime focus reflector needs only a single optical surface, on the front of the main mirror.
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A fountain sends water to a height of 100 meters. What must be the pressurization (above atmospheric) of the water system? 1 ATM = 1.01 × 10^5 N/m2
a. 1.0 ATM b. 4.2 ATM c. 7.2 ATM d. 9.7 ATM e. 8.2 ATM
Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.Angular momentum
a. is definitely conserved. b. is definitely not conserved. c. may or may not be conserved. d. none of the above
Which of the following is a property of Seyfert galaxies?
A. Their nuclei have abnormally low luminosities. B. The radiation from their cores fluctuates rapidly. C. Most are elliptical galaxies. D. They contain no gas clouds.
What causes Mercury's 3:2 spin-orbit resonance?
A) the planet's closeness to the Sun B) the planet's very eccentric orbit C) the planet's high density D) tidal torques operating on the planet E) All of the above are factors.