If its density suggests its core is similar to ours, why does Venus lack a magnetic field?
What will be an ideal response?
Venus' rotation is too slow to drive the dynamo effect that creates the magnetic field Earth has.
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What is the net power that a person with surface area of 1.20 m2 radiates if his emissivity is 0.895, his skin temperature is 27°C, and he is in a room that is at a temperature of 17°C? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 65.7 W B) 60.3 W C) 64.8 W D) 68.4 W E) 62.6 W
Moderators absorb neutrons
What will be an ideal response?
Which of the following observations provides direct evidence that galaxies containing active galactic nuclei have central, supermassive black holes?
A) the high orbital velocities of stars and gas clouds at the very centers of these galaxies B) jet velocities that approach the speed of light observed in gas at great distances from the galaxy centers C) large quantities of high-energy emission such as x-rays and gamma rays coming from these galaxies D) huge dark regions in the centers of these galaxies
An F-type star would have a larger habitable zone that does our Sun
Indicate whether the statement is true or false