List at least one naked-eye observation that is consistent with the ancient idea that Earth is at the center of the Milky Way. List at least one naked-eye observation that is inconsistent with the notion that Earth is at the center of the Milky Way
What will be an ideal response?
The actual center of the galaxy is hidden by nearby dust clouds, although in fact the southern summer Milky Way is much brighter than the northern winter portions. We see portions of only three spiral arms visually, with the brightest one lying toward Sagittarius in the summer southern sky.
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When atoms of two elements with a great difference in electronegativity bond together, the bonding is probably
a. ionic. b. polar covalent. c. covalent. d. metallic.
When you look at a single-slit diffraction pattern produced on a screen by light of a single wavelength, you see a bright central maximum and a number of maxima on either side, their intensity decreasing with distance from the central maximum. If the width of the slit is increased,
a. the pattern shrinks in size (central maximum less wide; other maxima in closer to it). b. the pattern increases in size (central maximum wider; other maxima farther from it). c. it does not affect the size of the pattern. d. the width of the central maximum increases, but the other maxima do not change in position or width. e. the width of the central maximum decreases, but the other maxima do not change in position or width.
A proton is projected with a velocity of 7.0 km/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the magnitude of the magnetic force that acts on the proton? (e = 1.60 × 10-19 C)
A) 13 × 10-16 N B) 6.7 × 10-16 N C) 0 N D) 3.4 × 10-16 N E) 4.2 × 10-16 N
Two blocks, having the same mass but different sizes, slide with the same constant speed on a smooth surface, then move onto a surface having friction coefficient ?k