Most of the oxygen in living cells is found in
A) carbohydrates
B) water
C) lipids
D) proteins
B
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What is the source for the lava that covers the maria?
A. the original molten surface of the Moon B. rock melted by radioactive heating C. molten rock from impacts D. volcanic eruptions due to subducting lunar crust
A proton is released from rest in a uniform electric field. Which statement is correct?
a. The proton will move in the same direction as the electric field to regions of higher electric potential. b. The proton will move in the same direction as the electric field to regions of lower electric potential. c. The proton will move in the opposite direction as the electric field to regions of higher electric potential. d. The proton will move in the opposite direction as the electric field to regions of lower electric potential.
An object is placed near a concave mirror having a radius of curvature of magnitude 60 cm. How far should you place the object from the mirror so that the lateral magnification produced by the mirror will be +2.5?
A) 18 cm B) 24 cm C) 30 cm D) 36 cm E) 42 cm
Recently, superconducting wire was made using magnesium diboride (S. Jin, H. Mavoori, C. Bower, and R. B. Van Dover, "High critical currents in iron-clad superconducting MgB2 wires," Nature 411, 563 (2001))
This is assumed to hold the promise of cheap efficient energy transmission. Explain how this might be true.