The Earth cannot contain a giant permanent magnet because
A) the Earth doesn't have enough iron.
B) the core would repel it.
C) the Earth isn't large enough.
D) ferromagnetism disappears at high temperature.
E) its magnetic field is too large.
D
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What does the CNO cycle and the hydrogen proton-proton cycle have in common? Choose the best answer to the question
A) They both trigger at the same temperature. B) They both are ways to fuse hydrogen nuclei to make helium. C) They are both cycles in star lives. D) They are both nuclear reactions; the CNO cycle makes carbon, nitrogen, and oxygen, and the proton cycle makes helium.
A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 ? ? m. How long would it have to be to have a resistance of 1.0 ??
A) 5.9 × 104 m B) 590 m C) 5.9 m D) 5.9 km E) 5.9 × 106 m
A wave is described by the function y(x,t) = (3.00 cm)cos[( 3.00 m-1)x + ( 4.00 s-1)t]. What is the wavelength of this wave?
A) 2.09 m B) 3.00 m C) 0.333 m D) 0.250 m E) 1.57 m
The prediction from special relativity that the length of a moving object will be shortened in the direction of motion is called __________
Fill in the blank(s) with correct word