IOAA 2013, Отборен тур, вертикални въпроси — Задача 11. K.

13 т.

Условие

i. Every that many years, the orientation of Earth’s axial tilt shifts by 1o1^{o}. (two decimals) [4 т.]

ii. When we swim in the sea, the height of our eyes from its level is 20cm20cm. How many kilometres away can we look on the surface of the Earth? (one decimal) [2 т.]

iii. Flare Stars, Type I Cepheids, RR Lyrae Variables [3 т.]

Hertzsprung–Russell diagram (visual luminosity, Sun=1, from 0.00001 to 100 000 and absolute magnitude versus colour B–V and spectral class O–M with temperatures) with luminosity classes Ia, Ib, II, III, IV, V and white dwarfs; seven white regions numbered 1–7 mark areas of variable stars: 1 top left supergiants, 2 and 3 diagonal strips across the giants, 4 near the upper main sequence, 5 among red giants, 6 on the lower main sequence, 7 on the white-dwarf sequence.

iv. The first Pulsar discovered was nicknamed LGM-1. Its official name is now PSR J1921 +2153. Its declination is __ °__’. [4 т.]

Отговори

Решение

Внимание: Непълно решение

The paper prints only the answer code after each question (the crossword grid entry); no worked solution is given.

Оригинал в Архива: Vertical_questions.pdf