Describe a lunar eclipse
What will be an ideal response?
Occasionally you can see the Moon darken and turn copper-red in a lunar eclipse. A lunar eclipse occurs at full moon when the Moon moves through the shadow of Earth. Because the Moon shines only by reflected sunlight, you see the Moon gradually darken as it enters the shadow. If you were on the Moon and in the umbra of Earth's shadow, you would see no portion of the Sun. If you moved into the penumbra, however, you would be in partial shadow and would see part of the Sun peeking around the edge of Earth so the sunlight would be dimmed but not extinguished. In a lunar eclipse, it is the Moon that is being hidden in the Earth's shadow and Earth that is "in the way" of the sunlight.
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Where on Earth would you have to be to observe a particular partial solar eclipse?
What will be an ideal response?
Two tiny beads, each of mass 3.2 g, carry equal-magnitude charges. When they are placed 6.4 cm apart and released in outer space, they begin to accelerate toward each other at 538 m/s2
What is the magnitude of the charge on each bead? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) 510 nC B) 44 nC C) 1800 nC D) 890 nC E) 1300 nC
Two lightbulbs both operate on 120 V. One has a power of 25 W and the other 100 W. Which lightbulb carries more current?
1.The dim 25-W lightbulb does. 2.The bright 100-W lightbulb does. 3.Both are the same.
Potential Energy: How much energy is necessary to place three +2.0-µC point charges at the vertices of an equilateral triangle of side 2.0 cm if they started out extremely far away? (k = 1/4??0 = 9.0 × 109 N ? m2/C2)
A. 4.5 J B. 5.4 J C. 6.7 J D. 7.6 J