Red giant stars are
A) close to exhausting their supply of hydrogen.
B) have already exhausted their supply of hydrogen.
C) are close to exhausting their supply of helium.
D) have already exhausted their supply of helium.
Answer: A
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A toroid is made of 2 000 turns of wire of radius 2.00 cm formed into a donut shape of inner radius 10.0 cm and outer radius 14.0 cm. When a 30.0-A current is present in the toroid, the magnetic field at a distance of 11.0 cm from the center of the toroid is
a. 0.0857 T. b. 0.109 T. c. 0.120 T. d. 0.600 T. e. 0.685 T.
It would be easier to pull the hemispheres apart
1) when they are at sea level 2) if submerged several meters in water 3) if high above the clouds because 4) external pressure on the hemispheres is lessened. 5) water serves as a lubricant. 6) the atmosphere exerts a pressure of 105 N/m2 on both hemispheres.
The ______________number in the periodic table is equal to an element’s number of valence electrons.
Fill in the blank(s) with the appropriate word(s).
Dawn images of Vesta show that it is much wider than it is tall. What might be the reason for its irregular shape?
What will be an ideal response?