The chemical formula that represents the burning of wood or paper is
A) CO2 ? C+O2.
B) C + O2 ? CO2.
C) C + O ? CO.
D) H2 + O ? H2O.
E) C + H2O ? CH2O.
B
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A metal block has a density of 5000 kg per cubic meter and a mass of 15,000 kg. What is its volume?
A) 0.33 cubic meters B) 3 cubic meters C) 5 cubic meters D) 15 cubic meters E) none of the above
A resistor R is connected across a battery of negligible internal resistance. If the resistance of R is cut in half, the power dissipated in R will ________ (indicate change, if any).
Fill in the blank(s) with the appropriate word(s).
What does temperature measure?
A) the average mass of particles in a substance B) the average size of particles in a substance C) the average kinetic energy of particles in a substance D) the total number of particles in a substance E) the total potential energy of particles in a substance
What is the purpose of crack meters?
What will be an ideal response?