Which of the following does not take place in a chemical reaction?
a. New substances are formed.
b. Neutrons are released.
c. Energy is released or absorbed.
d. Reactants disappear.
b
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The diameter of a typical star (the sun) is approximately ____ times larger than the diameter of a typical planet (the Earth)
a. 10 b. 100 c. 1000 d. 10,000 e. 100,000
Pressure is measured in a 1.1 cm radius water hose at a height of 1.5 m above the floor of a house and compared to that in a hose connected to the first (of radius 2.2 cm). If the pressure in the larger radius hose is the same as that in the smaller radius hose, how far above the floor is the location for this pressure measurement?
A. 0.23 N B. 8.1 N C. 0.81 N D. 2.3 N
Based on the graph, when was the maximum abundance of CO2 over the past 800,000 years?
A) about 300,000 years ago B) about 125,000 years ago C) 1750 D) now
A pulley system can
A) change the direction of a force. B) multiply a force. C) both of these D) none of the above