The percentage (by number of atoms) of the Sun that is hydrogen is about
A) 91%.
B) 71%.
C) 27%.
D) 9%.
E) less than 1%.
A
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During an isothermal process, 5.0 J of heat is removed from an ideal gas. How much work does the gas do during this process?
A) 5.0 J B) 10 J C) -5.0 J D) 2.0 J E) 0.00 J
A circular loop of one turn and radius 5.0 cm is positioned with its axis parallel to a magnetic field of 0.60 T. By means of high explosives, the area of the loop is suddenly reduced to essentially zero in 0.50 ms. What emf is induced in the loop?
What will be an ideal response?
Which of the following is a general difference between a planet and a star?
A) Stars shine with energy released by nuclear fusion while planets shine primarily with light reflected from stars. B) Stars are found in galaxies, but planets are not part of galaxies. C) Stars are made of gas and planets are made of rock. D) Stars are stationary while planets orbit stars.
Exoplanets having masses between 2 and 10 Earth masses are called ________
Fill in the blank(s) with correct word