Estimation: A reasonable estimate for the height of the walls in an ordinary American home is
A. 10 m.
B. 8 m.
C. 2.5 m.
D. 1.5 m.
Answer: C
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Three point charges, two positive and one negative, each having a magnitude of 20 mC are placed at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the electrostatic force on the negative charge?
a. 80 N b. 40 N c. 69 N d. 57 N e. 75 N
The upper mantle can be divided into two portions, the
A) asthenosphere (lower zone of the upper mantle) and part of the lithosphere (the top zone of the upper mantle). B) asthenosphere (top zone of the upper mantle) and the lithosphere (the lower upper mantle). C) Moho and the lithosphere. D) continental mantle and the oceanic mantle.
If the potential at point A is one volt it means that
A. an object at A has charge equal to one coulomb. B. an electron at A can perform one Joule of work. C. a charge at A has potential energy one joule for each coulomb of charge. D. there is a small battery present.
Thermal Expansion: The density of water at 0°C is 999.84 kg/m3 and at 4°C it is 999.96 kg/m3. A 1.0-L container, full to the brim with water at 4.0°C is placed in the refrigerator. By the time that the temperature of the water reaches 0.0°C, what volume of water has spilled from the container, assuming that the contraction of the container is negligible?
A. 1.1 × 10-7 m3 B. 1.2 × 10-7 m3 C. 1.3 × 10-7 m3 D. 1.4 × 10-7 m3 E. 1.5 × 10-7 m3