A binary star system in the constellation Orion has an angular separation between the two stars of 1.2 × 10^?5 radians. If ? = 5 × 10^?7 m, what is the smallest-aperture (diameter) telescope that may be used to resolve the two stars?
a. 10 cm
b. 5 cm
c. 50 cm
d. 1 m
e. 4 cm
b
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You observe two distant galaxies (well outside our Local Group of galaxies). You find that Galaxy W is moving away from us at a speed of 35,000 km/s and Galaxy X is moving away from us at a speed of 70,000 km/s. What can you say about the distances to those galaxies?
A) Galaxy W is four times as far as Galaxy X. B) Galaxy W is twice as far as Galaxy X. C) She can't say anything about the distances to Galaxy W or X. D) Galaxy X is four times as far as Galaxy W. E) Galaxy X is twice as far as Galaxy W.
What would happen if a small piece of neutron star material (say the size of a paper clip) struck the Earth?
What will be an ideal response?
The solar cycle is a result of the
A. nuclear fusion at the core of the Sun. B. motion in the convection zone cycling material into the Sun's core. C. loss of energy in the Sun's magnetic field through flares, sunspots, and prominences. D. differential rotation of the Sun.
Newton's second law focuses on
A) speed. B) velocity. C) acceleration. D) none of the above