Why do oppositions of Mars stir such interest among amateur astronomers?
What will be an ideal response?
Mars is small, and most of the time so distant from Earth that amateur telescopes have a problem seeing anything but an orange disk. But when the Earth overtakes Mars every 2.2 years, Mars gets close enough to us to appear much larger and to show a good deal of surface features and atmospheric clouds, polar caps, and dust storms.
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Spherical Mirrors: An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm. How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?
A. 18 cm B. 24 cm C. 30 cm D. 36 cm E. 42 cm
In which case will the woman see a rainbow of color interrupted by a few dark absorption lines?
A) Case 1 B) Case 2 C) Case 3 D) Case 4
What is the approximate diameter of the Milky Way Galaxy in light-years?
A. 100 B. 10 C. 100,000 D. 1,000,000 E. 1,000
A steel rod 55 cm long has a diameter of 30 cm. The compressive strength (the maximum stress it can support without breaking) of this steel is 500 × 106 N/m2. What is the compression force that would break the rod?
A) 3.5 × 107 N B) 2.4 × 107 N C) 1.4 × 108 N D) 4.7 × 108 N E) 8.9 × 108 N