Physics

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Why is continental crust lower in density than seafloor crust? A) Continental crust is made of ... Started by jilianpiloj	3 Replies 268 Views	Jul 27, 2018 by Ddddd
Why does stellar main-sequence lifetime decrease with increasing stellar mass? A) It doesn't; ... Started by clippers!	1 Replies 135 Views	Jul 27, 2018 by emsimon14
How fast do tectonic plates move on Earth? A) quite fast, but only during earthquakes B) a few ... Started by bobthebuilder	1 Replies 153 Views	Jul 27, 2018 by Jordin Calloway
The planet HAT-P-32b has more than twice the radius of Jupiter, yet is only the same mass. It orbits ... Started by MirandaLo	1 Replies 79 Views	Jul 27, 2018 by alexisweber49
Which element has the lowest mass per nuclear particle and therefore cannot release energy by either ... Started by KWilfred	3 Replies 62 Views	Jul 27, 2018 by ecabral0
Imagine a Star Wars type spaceship in orbit around a planet. Its engine suffers a severe ... Started by xclash	1 Replies 177 Views	Jul 27, 2018 by juiceman1987
How does a rocket launch upwards? Choose the statement that best describes why a rocket goes up. ... Started by JGIBBSON	1 Replies 172 Views	Jul 27, 2018 by pikon
The astronauts feel weightless in the International Space Station, which orbits the Earth once every ... Started by ENagel	1 Replies 90 Views	Jul 27, 2018 by Koolkid240
What types of stars end their lives with supernovae? A) all stars that are yellow in color B) ... Started by luvbio	3 Replies 88 Views	Jul 27, 2018 by Shshxj
Which of the following statements about the stages of nuclear burning in a massive star is not true? ... Started by s.tung	1 Replies 59 Views	Jul 27, 2018 by morganmarie791
Helium originates from A) stellar nucleosynthesis only. B) the Big Bang only. C) mostly from ... Started by Haya94	1 Replies 159 Views	Jul 27, 2018 by ApricotDream
Of the four gases CO2, H2O, N2, and O2, which are greenhouse gases? A) CO2 and H2O B) all except ... Started by NClaborn	1 Replies 99 Views	Jul 27, 2018 by jgranad15
Why did the Big Bang not produce heavier elements? A) They did, but radioactive decay caused ... Started by MirandaLo	3 Replies 98 Views	Jul 27, 2018 by blakeserpa
What would happen to the planets in a solar system where the central star did not have a strong ... Started by nevelica	1 Replies 43 Views	Jul 27, 2018 by smrerig
Which event marks the beginning of a supernova? A) the expansion of a low-mass star into a red ... Started by wrbasek0	1 Replies 89 Views	Jul 27, 2018 by k2629
In a ten-billion to one scale model, the Sun and the Earth are about the size of A) a grapefruit ... Started by NguyenJ	1 Replies 64 Views	Jul 27, 2018 by nicoleclaire22
After a supernova event occurring in a high-mass star, what is left behind? A) always a white ... Started by Anajune7	3 Replies 109 Views	Jul 27, 2018 by matt95
Consider the elliptical orbit of a comet around the Sun. Where in its orbit does it have the largest ... Started by OSWALD	1 Replies 109 Views	Jul 27, 2018 by polinasid
What could happen in planetary systems where the nebular gas is quickly disbursed? A) No ... Started by casperchen82	1 Replies 85 Views	Jul 27, 2018 by Sammyo
If a gas cloud shrinks, it A) spins slower. B) spins faster. C) spins at the same rate as it ... Started by bobypop	1 Replies 121 Views	Jul 27, 2018 by alexisweber49
Astronomers have discovered more extrasolar planets around other stars than the number of planets in ... Started by bobthebuilder	3 Replies 131 Views	Jul 27, 2018 by sabina576
If a gas cloud shrinks, its gravitational potential energy is converted into A) chemical energy. ... Started by D2AR0N	1 Replies 135 Views	Jul 27, 2018 by emily12345
Our textbook discusses the cosmic calendar, a model of the history of the universe scaled to a ... Started by kshipps	1 Replies 87 Views	Jul 27, 2018 by Viet Thy
If I drop a golf ball and a bowling ball simultaneously from same height above the ground, what will ... Started by abern	1 Replies 138 Views	Jul 27, 2018 by KKcool
How does the theory of inflation explain the near-uniformity of the cosmic microwave background? ... Started by notis	3 Replies 112 Views	Jul 27, 2018 by patma1981