Why is a brown dwarf not considered a star?
What will be an ideal response?
A brown dwarf is an object with a diameter only about the size of Jupiter, and although they are still warm from contraction, they do not generate energy, therefore they are not stars.
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What do we mean by a runaway greenhouse effect?
A) a greenhouse effect that keeps getting stronger until all of a planet's greenhouse gases are in its atmosphere B) a greenhouse effect that starts on a planet but later disappears as gases are lost to space C) a greenhouse effect that heats a planet so much that its surface rock melts D) a process that heats a planet's surface, but that doesn't require the presence of greenhouse gases
Mars currently lacks surface habitability mostly because of
A) the chemical composition of its atmosphere B) its distance from the Sun C) its small size D) the chemical composition of its surface
A proton is accelerated from rest through a potential difference of 2.5 kV and then moves perpendicularly through a uniform 0.60-T magnetic field. What is the radius of the resulting path?
A. 15 mm B. 12 mm C. 18 mm D. 24 mm E. 8.5 mm
A circular loop of radius 0.10 m is rotating in a uniform external magnetic field of 0.20 T. Find the magnetic flux through the loop due to the external field when the plane of the loop and the magnetic field vector are
(a) parallel. (b) perpendicular. (c) at an angle of 30° with each other.