Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge.
b. Z has a negative charge.
c. Y has a positive charge.
d. Z is neutral (has no net charge).
e. Y is negatively charged or neutral (has no net charge).
e
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Work-Energy Theorem: The horizontal force that an animal exerts on a large fruit it has found is observed and is shown in the graph in the figure. If the fruit was initially sliding on the frictionless ground at 5.5 cm/s when the animal first grabbed it, by how much did the animal change its kinetic energy during this encounter?
A. 12.5 J B. 50 J C. 25 J D. 22 J E. 0 J
All electromagnetic waves have the same physical characteristics. They differ only in frequency and wavelength. How are they classified into different types?
When did the objects that we now see as asteroids and comets form in the solar system?
a. Before the cloud flattened into a disk. b. After the cloud flattened into a disk but before solid particles condensed from the gas. c. After solid particles condensed from the gas but before the planets finished forming. d. After the planets finished forming.
Emission lines of hydrogen that are found in the ultraviolet part of the electromagnetic spectrum are formed by electrons transitioning from:
A) any level to level 2. B) level 2 to any level. C) any level to level 1. D) level 1 to any level. E) any level to level 3.