During the period each year when we see Mars undergoing apparent retrograde motion in our sky, what is really going on in space?
A) Earth and Mars are getting closer together.
B) Mars is moving around the Sun in the opposite direction from which Earth is moving around the Sun.
C) Earth is catching up with and passing by Mars in their respective orbits.
D) Earth and Mars are on opposite sides of the Sun.
C
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Why do we believe that starburst galaxies represent a temporary stage in galaxy evolution?
A) We observe starbursts to last only a few years at a time. B) Such galaxies produce so much light that they would have consumed all their gas long ago if they had always been forming stars at this high rate. C) We don't see any nearby starburst galaxies. D) All starburst galaxies look like normal spiral galaxies, aside from the starbursts.
Find the tension in an elevator cable if the 1000-kg elevator is ascending with an acceleration of 1.2 m/s2, upward
a. 11,000 N c. 8600 N b. 9800 N d. 1200 N
An important reason for using a very large diameter objective in an astronomical telescope is
A) to increase the magnification. B) to increase the resolution. C) to form a virtual image, which is easier to look at. D) to increase the width of the field of view. E) to increase the depth of the field of view.
Explain the differences between a hypothesis, theory and a natural law
What will be an ideal response?