Two stars, Fred and Barney, are of the same size. Fred has spectral type F, while Barney has spectral type B. Which one is more luminous? What are their relative locations on the HR diagram?
What will be an ideal response?
Barney has a hotter surface temperature than Fred. Since they have the same surface area, Barney is also more luminous. Barney appears above and to the left of Fred.
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Answer the following statement true (T) or false (F)
Of these, which is evidence that Mars once had running water on its surface?
A. There are vast amounts of H2O present in Martian rocks. B. Spacecraft have observed channels and dry riverbeds on the Martian surface. C. There is a medium-sized ocean in the Southern Hemisphere of Mars. D. There is no such evidence.
An organ pipe, open at both ends, is 5.20 m long. What is its fundamental frequency? The speed of sound in air is 343 m/s
A) 16.5 Hz B) 33.0 Hz C) 66.0 Hz D) 99.0 Hz E) 132 Hz
A 3.0-?F capacitor charged to 40 V and a 5.0-?F capacitor charged to 18 V are connected to each other, with the positive plate of each connected to the negative plate of the other. What is the final charge on the 3.0-?F capacitor?
a. 11 ?C b. 15 ?C c. 19 ?C d. 26 ?C e. 79 ?C