Estimate how many textbooks of 1000 pages stacked on top of each other would make a stack of books 10 feet high.
A. 60
B. 50
C. 40
D. 30
E. 20
A. 60
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What distinguishes the spectral type of a star?
A. the lines in its spectrum B. its brightness C. its distance D. its velocity
We can find the masses and diameters of stars that are in eclipsing binary systems
Indicate whether the statement is true or false
A 0.10-kg ball is moving at 7.0 m/s when it is hit by a bat, causing it to reverse direction and have a speed of 12.0 m/s. What is the change in the magnitude of the momentum of the ball?
a. 0.50 kg/m/s b. 5.0 kg/m/s c. 0.70 kg/m/s d. 1.9 kg/m/s e. 1.2 kg/m/s
The principal axis is the
A) straight line drawn from the center of curvature to the mid point of the mirror. B) straight line drawn from the center of curvature to any point of the mirror. C) straight line drawn from the center of curvature to a point on the outer edge of the mirror. D) straight line joining any two points on the mirror. E) None of the other answers given is correct.