Given the equation 
, which answer or answers provide(s) the best description of a possible physical situation?
A. A 20.00-N tension pulls a 2.00-kg mass. The 2.00-kg mass pulls another 2.00-kg mass.
B. A 20.00-N force pushes a 2.00-kg mass. The 2.00-kg mass pushes another 2.00-kg mass.
C. A 2.00-kg mass on a flat surface is acted on by gravity while another 2.00-kg mass sits on top of it.
D. All of the situations above are possible.
E. Only (a) and (b) above are possible.
Answer: E
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Semiconductor elements are "doped" in order to
A. make them less susceptible to temperature changes. B. make them electrically charged. C. eliminate the possibility of incomplete bonds. D. increase their electrical conductivity.
Consider a scale on which our entire Milky Way Galaxy is about the size (diameter) of a grapefruit. Which of the following best describes the size and distance of the Andromeda Galaxy on the same scale?
A) a grapefruit about 3 meters away B) a grapefruit about 3 centimeters away C) a beach ball about the length of a football field away D) a peanut about 3 centimeters away E) a grapefruit about 3 kilometers away
The figure shows a graph of the acceleration of a 125-g object as a function of the net force acting on it. What is the acceleration at points A and B?
What will be an ideal response?
An eclipse season is the period of time during which the
a. Moon crosses a node in its orbit. b. Sun crosses a node in the Moon's orbit. c. line of nodes crosses the Moon's orbit. d. Moon is new or full. e. Moon is visible during the day.