In the context of nuclear fusion in massive stars, hydrogen fusion can last 7 million years in a 25-solar-mass star, but that same star will fuse its oxygen in six months and its silicon in just one day
Indicate whether the statement is true or false
True
You might also like to view...
Edwin Hubble was the first to classify galaxies in three main types: spirals, ellipticals and irregulars.
Answer the following statement true (T) or false (F)
If you could watch a time-lapse movie of the interstellar medium over hundreds of millions of years, what would you see?
A) Gas that changes only in very slow and steady ways, so that the movie would in fact be quite boring. B) The entire disk of the Milky Way would pulsate in and out as it contracts to form stars and then blows out in supernovae and then contracts to form stars again and so on. C) The movie would alternate back and forth between being very bright when there is a lot of gas and very dark when there is very little gas. D) Gas that is often moving at high speed, particularly after one or more supernovae, and constantly changing form between molecular clouds, atomic hydrogen, and hot, ionized bubbles and superbubbles.
A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the horizontal distance to the point where the football hits the ground?
A) 20 m B) 35 m C) 18 m D) 60 m E) 30.0 m
Initially, a blue automobile has twice the kinetic energy that a red automobile has. Both are braked to a stop; both have the same amount of braking force. The red auto will stop in ________ as the blue auto.
A. half the distance B. four times the distance C. the same distance D. twice the distance E. one fourth the distance