IOAA 2013, Отборен тур, вертикални въпроси — Задача 15. O.
13 т.
Условие
i. The maximum effective temperature of the surface of a Cepheid is and the minimum is . The difference between its brightness maximum and minimum is Absolute Bolometric Magnitudes. How many times bigger is the maximum radius of the Cepheid than its minimum radius? (one decimal) [2 т.]
ii. In 2013, after how many days after the Summer Solstice did the Earth reach Aphelion? (integer) [2 т.]
iii. The Sun belongs to the Population __ stars. [1 т.]
iv. The comet LINEAR is a periodic comet with aphelion distance of 5.29 A.U. And aphelion velocity as 10.45km/s. What is the semi-major axis of its orbit in A.U.? (up to 1 decimal) [2 т.]
v. Identify the following planets by recognizing their internal structure: Jupiter, Neptune, Mercury [3 т.]
vi. A main sequence star “fuses” Hydrogen at a rate of kg/s. Its luminosity (in W) if mass-defect is only 0.007. (integer) [3 т.]
Отговори
i. 15
Printed after the question as the grid entry (“- 15”) of the crossword answer sheet.
ii. 14
Printed after the question as the grid entry (“- 14”) of the crossword answer sheet.
iii. 1
Printed after the question as the grid entry (“- 1”) of the crossword answer sheet.
iv. 39
Printed after the question as the grid entry (“- 39”) of the crossword answer sheet.
v. 451
Printed after the question as the grid entry (“- 451”) of the crossword answer sheet.
vi. 742
Printed after the question as the grid entry (“- 742”) of the crossword answer sheet.
Решение
Внимание: Непълно решение
The paper prints only the answer code after each question (the crossword grid entry); no worked solution is given.
i. - 15
ii. - 14
iii. - 1
iv. - 39
v. - 451
vi. - 742
Оригинал в Архива: Vertical_questions.pdf