How far above or below the equator can the Sun appear to move? Why?
What will be an ideal response?
The Earth's axial tilt means the Sun's declination can reach 23.5 degrees north or south of the equator at the solstices.
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Addition by Components: Vector 
has magnitude 2 units and is directed to the north. Vector 
has magnitude 5 units and is directed to the south. Calculate the magnitude and direction of 
- 
.
A. 7 units, north B. 7 units, south C. 3 units, north D. 3 units, south
How did the Copernican model explain the apparent retrograde motion of the planets?
What will be an ideal response?
A 20-m long steel wire (cross-section 1.0 cm2, Young's modulus 2.0 × 10^11 N/m2), is subjected to a load of 25 000 N. How much will the wire stretch under the load?
a. 0.25 cm b. 2.5 cm c. 12.5 cm d. 25 cm e. 1.25 cm
Why was it difficult for astronomers to develop a clear understanding of the Milky Way until the last few decades?
What will be an ideal response?