What perception of the Milky Way Galaxy did astronomers have in 1900?
A) They believed that the Earth rested inside concentric spheres, with the Milky Way stars fixed to the outermost sphere.
B) They believed that the Milky Way was one of billions of galaxies in the universe.
C) They believed that the Milky Way was the entire universe.
D) They believed that, because the Sun was at the center of the Milky Way, it was impossible to see the rest of the universe.
E) They believed we were one of billions galaxies in an expanding universe.
C
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A car accelerates from 10.0 m/s to 30.0 m/s at a rate of 3.00 m/s2. How far does the car travel while accelerating?
A) 80.0 m B) 133 m C) 226 m D) 399 m
Gabbro and rhyolite are classified as ______________rocks
Fill in the blank(s) with correct word
Small telescopes are often advertised as " 200 power" or "magnifies 200 times." How would you change these advertisements to market to astronomers?
What will be an ideal response?
Imagine a downhill race between four objects each of mass M. One object such as a skier (P) is best modeled as a particle (shown as a small flat object) translating down the hill. The other objects are modeled as a solid cylinder (C), hoop (H) and a solid sphere (S) each of radius R rolling down the hill without slipping. All four objects start from rest a t a height h. Assuming mechanical energy losses due to friction may be ignored, determine the order in which the objects cross the finish line. Use their letter designation: P, C, H and S and arrange them from first to last to arrive at the finish line.
