Based on the number of galaxies visible in the Hubble Deep Field (Figure 20.1 in your textbook), the estimated number of galaxies in our observable universe is
A) about 50,000.
B) about 100 million.
C) about 100 billion.
D) an infinite number.
C
Physics & Space Science
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Lunar eclipses can occur only during a
A) new Moon. B) first quarter Moon. C) full Moon. D) third quarter Moon.
Physics & Space Science
A violinist discovers while tuning her violin that her string is flat (has a lower frequency). She should
A. tighten the string. B. loosen the string. C. play faster.
Physics & Space Science
Flow channels on Venus suggest it was once rich in water
Indicate whether the statement is true or false
Physics & Space Science
If two forces of equal magnitude act on an object that is hinged at a pivot, the force acting farther from the pivot must produce the greater torque about the pivot
A) True B) False C) unable to decide without knowing the shape of the object
Physics & Space Science