Which of the following is not a key line of evidence supporting the hypothesis that Mars once had abundant liquid water on its surface?
A) the canals of Mars mapped by Percival Lowell
B) small, rounded pebbles found in places that look like dry riverbeds
C) chemical analysis of minerals found in what appear to be ancient lakebeds
D) the eroded rims of ancient craters
A) the canals of Mars mapped by Percival Lowell
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A mass is attached to a vertical spring and bobs up and down between points A and B. Where is the mass located when its kinetic energy is a minimum?
A) midway between A or B B) at either A or B C) one-fourth of the way between A and B
Carnot Engine: Two ideal Carnot heat engines have the same efficiency. One operates between 5.0 × 102 K and 3.0 × 102 K, and the other between 4.0 × 102 K and some lower temperature. What is the lower temperature?
A. 200 K B. 220 K C. 240 K D. 260 K E. 280 K
Explain why the sky is blue
What will be an ideal response?
Consider a capacitor connected across the ac source. As the capacitance is increased, the current through the capacitor will
A) increase. B) remain constant. C) decrease.