In ________ models, the Sun is assumed as the center of the solar system.
A. Heliocentric
B. Epicyclic
C. Anthropomorphic
D. Geocentric
Answer: A
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A set of data points is plotted in the graph at right. Which points should be used to find the slope of the line?
A. The blue circles. B. The red X’s. C. The green triangles.
Stars with ˜0.4-4 solar masses swell into giants when hydrogen is exhausted in their centers
a. True b. False Indicate whether the statement is true or false
An aluminum wire and a steel wire, each of length 2.0 m, are hung from the ceiling. A 5.0-kg mass is suspended from the lower end of each wire
The aluminum wire has a diameter of 2.2 mm. What must be the diameter of the steel wire if it is to stretch the same distance as the aluminum wire, so that the two wires maintain equal lengths after the masses are attached? Young's modulus for aluminum is 0.70 × 1011 N/m2 and for steel it is 2.0 × 1011 N/m2.
The figure above shows the geological time scale of Earth. Life has existed for ________ of the Earth's history.
A) all B) about 90% C) about 50% D) about 25%