Spectra show that the moons of Uranus contain frozen water, although their surfaces are _______________
Fill in the blank(s) with correct word
dark
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You are standing near a railroad track and a train is moving toward you at 60 mph and blowing its horn. What will you notice as the train moves past you?
a. As the train approaches, the horn will sound lower in pitch than when the train is moving away. b. As the train approaches, the horn will sound higher in pitch than when the train is moving away. c. There will be no change in the pitch of the horn as it moves by. d. The horn will get louder as the train moves away from you. e. The horn will get quieter as the train moves toward you.
Explain what the granulation of the solar surface is related to
What will be an ideal response?
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the lowest point, where 
is the normal force, 
is weight, and
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B.
C.
D.
E.
A charge of +80 ?C is placed on the x axis at x = 0 . A second charge of ?50 ?C is placed on the x axis at x = 50 cm. What is the magnitude of the electrostatic force on a third charge of 4.0 ?C placed on the x axis at x = 30 cm?
a. 13 N b. 77 N c. 39 N d. 25 N e. 45 N