The Great ________ Spot of Neptune was striking in 1989, but gone by 1995
Fill in the blank(s) with correct word
Dark
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Observations indicate that the Moon has water ice in craters near the poles. Where do scientists suspect this water came from?
A) ice brought by comet impacts long ago B) ice supplied to the Moon by impacts that occurred within the past century or so C) the ice formed from the condensation of water released by outgassing on the Moon D) The Moon has significant amounts of water bonded in its crust, so some of this water fills the polar craters.
Emission nebulae are created by gas absorbing ultraviolet energy from the hot young stars within them, such as in the Orion Nebula
Indicate whether the statement is true or false
You whirl a 2-kg body attached to a 1 meter cord around your head in a nearly horizontal circle with a speed of 4 m/s. The tension in the cord is _________
Fill in the blank(s) with correct word
Iron atoms have a greater tendency to oxidize than do copper atoms. Is this good news or bad news for a home in which much of the plumbing consists of iron and copper pipes connected together? Explain
A) This is bad news, since the iron atoms will be reduced by the copper atoms. B) This is not a problem, since the strength of the copper will make up for the weakness of the iron. C) It is bad news. The iron atoms will lose electrons to the copper atoms, which will pass those electrons onto oxygen atoms that are in contact with the surface. D) This is not a problem since any electrons lost will be replaced by copper electrons.