Upper-main-sequence stars, more massive than the Sun, fuse hydrogen by a process called the _____
A) proton-proton chain
B) carbon-nitrogen-oxygen cycle
C) zero-age main sequence
D) proton-neutron chain
B
Physics & Space Science
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Steep-sided stratovolcanoes are made from lava that
A) is as runny as liquid water.
B) has a medium viscosity.
C) has a high viscosity.
D) can have any viscosity.
Physics & Space Science
The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
Which of the following aluminum alloys is strain hardened and stabilized to full hardness?
(a) 5052-H38 (b) 2024-T62 (c) 3003-H18 (d) 2090-T86
Physics & Space Science
Two objects move toward each other due to gravity. As the objects get closer and closer, the acceleration of each
A) increases. B) decreases. C) is not affected.
Physics & Space Science