Visible sunspots lie in the
A) chromosphere.
B) transition zone.
C) corona.
D) radiative zone.
E) granulation in the photosphere.
E
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Why did these astronomers take so many different pictures of the same patch of sky?
A: To "top" a previous study by rival astronomers, who took slightly fewer images. B: Galaxies have brightnesses that vary over hours or days, and they needed to be sure to get roughly equal light from all of them. C: To average over many images and keep only the consistent object details, filtering out random single-exposure events like charged particles from the solar wind. D: Needed a separate image for every nanometer-increment wavelength from 350nm to 800nm, to compile the final full-color image. E: It's not NASA's fault that pulsar in the foreground kept blinking!
A solid sphere, a solid cylinder, a spherical shell, and a hoop all have the same mass and radius. Each are rolling on a horizontal surface with the same center of mass speed, and then they roll up identical inclines. Which one goes the greatest distance up its incline?
A. the hoop B. the solid sphere C. the spherical shell D. the cylinder E. They all go the same distance up their inclines.
Fusion in giant stars takes us all the way to iron before a Type II supernova occurs. Why did it stop with helium in the far more energetic Big Bang?
What will be an ideal response?
A satellite is in circular orbit at an altitude of 1500 km above the surface of a nonrotating planet with an orbital speed of 9.2 km/s
The minimum speed needed to escape from the surface of the planet is 14.9 km/s, and G = 6.67 × 10-11 N ? m2/kg2. The orbital period of the satellite is closest to A) 72 min. B) 65 min. C) 58 min. D) 51 min. E) 44 min.