Stars are powered by ________
Fill in the blank(s) with correct word
nuclear fusion
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At what altitude and in what direction in your sky does the north or south celestial pole appear?
What will be an ideal response?
Two identical containers, A and B, hold equal amounts of the same ideal gas at the same Po, Vo and To. The pressure of A then decreases by a half while its volume doubles; the pressure of B doubles while its volume decreases by a half. Which statement correctly describes the temperatures of the gases after the changes?
A. TA = 0.5TB = To. B. TB = 0.5TA = To. C. TB = TA = To. D. TA = 2TB = To. E. TB = 2TA = To.
An electron is accelerated from rest through a potential difference. After acceleration the electron has a wavelength of 880 nm
What is the potential difference responsible for the acceleration of the electron? (h = 6.626 × 10-34 J ? s, melectron = 9.11 × 10-31 kg, e = 1.6 10-19 C) A) 1.7 × 10-6 V B) 2.5 × 10-6 V C) 1.9 × 10-6 V D) 2.2 × 10-6 V
During the period of one day, the number of high tides at a given point is about
a. one b. two c. three d. four e. none of the above