Briefly explain why high-mass stars have shorter lifetimes than low-mass stars
What will be an ideal response?
High-mass stars have 10 to 100 times more mass (fuel) than a typical low-mass star. This greater mass produces a much higher downward gravitational pressure, leading to much higher core temperatures and higher rates of fusion. The luminosity of such stars is therefore 1,000 to 1 million times greater than in low-mass stars. So, although high-mass stars have more fuel to burn, they burn it at a much higher rate and therefore run out of fuel much more quickly.
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A car traveling with velocity v is decelerated by a constant acceleration of magnitude a. It takes a time t to come to rest. If its initial velocity were doubled, the time required to stop would
A) double as well. B) decrease by a factor of two. C) stay the same. D) quadruple. E) decrease by a factor of four.
A(n) ______________ is an elementary particle with a charge of +1.6 × 10^-19 coulomb
Fill in the blank(s) with correct word
Which of the following best describes a substance in which the temperature remains constant while at the same time it is experiencing an inward heat flow?
a. gas c. solid b. liquid d. substance undergoing a change of state
Which of the following discoveries was NOT made by Voyager 1 or 2?
A) Jupiter has an encircling ring. B) Jupiter's magnetosphere extends beyond the orbit of Saturn. C) Jupiter has cloud bands in its upper atmosphere. D) Jupiter's moons are as varied as the surfaces of the terrestrial planets. E) Jupiter's Great Red Spot is characterized by swirling patterns much like a hurricane.