Looking for an Earth-size planet around a nearby star (besides the Sun) is like looking for a pinhead located ________
A) across the street
B) a few hundred kilometers away
C) thousands of kilometers away
D) across the length of a football field
C
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The primary purpose of a lightning rod is to
A) attract lightning and guide it to the ground. B) discharge the structure to which it is attached. C) cancel the electric field within the structure to which it is attached. D) induce a charge opposite to that of charged clouds overhead.
The energy levels of an element and its ions are the same
Indicate whether the statement is true or false
Why do rich clusters of galaxies contain a larger fraction of ellipticals than poor clusters or groups of galaxies?
What will be an ideal response?
A magnetic field is directed out of the page. Two charged particles enter from the top and take the paths shown in the figure. Which statement is correct?
A. Particle 1 has a positive charge and particle 2 has a negative charge. B. Both particles are positively charged. C. Both particles are negatively charged. D. Particle one has a negative charge and particle 2 has a positive charge. E. The direction of the paths depends on the magnitude of the velocity, not on the sign of the charge.