A girl throws a stone from a bridge. Consider the following ways she might throw the stone. The speed of the stone as it leaves her hand is the same in each case, and air resistance is negligible. Case A: Thrown straight up
Case B: Thrown straight down. Case C: Thrown out at an angle of 45° above horizontal. Case D: Thrown straight out horizontally. In which case will the speed of the stone be greatest when it hits the water below? A) Case A
B) Case B
C) Case C
D) Case D
E) The speed will be the same in all cases.
E
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Suppose that we have two containers, one holding N molecules of helium gas, and one holding N/2 molecules of oxygen gas. Both are initially at room temperature. We then add the same amount of energy to each gas. Which is hotter at the end?
A. The helium B. The oxygen C. Both have about the same temperature. D. One cannot say without measuring.
How would Ptolemy explain the rising of the Sun? Contrast this to Copernicus' explanation of the same event
What will be an ideal response?
The Milky Way Galaxy
a. contains about 100 billion stars. b. is about 200 light-years in diameter. c. is the largest known object in the universe. d. all of the above e. a and c
A ___________________ binary is shown in the above simulated spectra
a. single-lined spectroscopic
b. double-lined spectroscopic
c. visual
d. eclipsing