The nucleus makes up about what percentage of
the mass of an atom?
a) 25%
b) 50%
c) 81.3%
d) more than 99%
d
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A straight 10-cm wire bent at its midpoint so as to form an angle of 90° carries a current of 10 A. It lies in the xy plane in a region where the magnetic field is in the positive z direction and has a constant magnitude of 3.0 mT. What is the magnitude of the magnetic force on this wire?
A. 3.2 mN B. 2.1 mN C. 5.3 mN D. 4.2 mN E. 6.0 mN
When balancing a chemical equation, you must
a) be able to count individual atoms on each side of the reaction arrows. b) count only the polyatomic ions present in the reactants and the products. c) count only complete molecules and ignore any atoms that are in their elemental (uncombined) forms. d) make sure that there are always more atoms of reactant present than atoms of product, so that the reaction can proceed easily.
The color of the powder of a mineral is known as the mineral's
a. index of refraction. b. hardness. c. specific gravity. d. streak.
The temperature on an Oswego, New York "warm" spring day has a maximum of 64°F and a minimum of 30°F. What is the number of heating degree days?
a. 18 b.30 c. 34 d. 47 e. 64