Lenz's Law: As shown in the figure, a C-shaped conductor is in a uniform magnetic field B out of the page, and this field is increasing. What is the polarity of the induced emf in terminals X and Y?
A. X and Y are at the same potential.
B. X is positive and Y is negative.
C. Y is positive and X is negative.
Answer: C
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Specific Heat: It is necessary to determine the specific heat of an unknown object. The mass of the object is 201.0 g. It is determined experimentally that it takes 15.0 J to raise the temperature 10.0°C. What is the specific heat of the object?
A. 7.46 J/kg ? K B. 1500 J/kg ? K C. 0.00130 J/kg ? K D. 3,020,000 J/kg ? K
Resistance and Resistivity: A certain metal wire has a cross-sectional area of 1.0 cm2 and a resistivity of 1.7 × 10-8 ? ? m. How long would it have to be to have a resistance of 1.0 ??
A. 5.9 × 106 m B. 5.9 m C. 5.9 × 104 m D. 590 m E. 5.9 km
The ecliptic can be defined as
a. the plane that is perpendicular to the Earth's axis of rotation. b. the projection of the Earth's equator onto the sky. c. the path traced out by the Moon in our sky in one month against the background stars. d. the path traced out by the Sun in our sky over one year against the background stars.
the greater average kinetic energy per molecule,
A. The quantity is greater for gas A. B. The quantity is greater for gas B. C. The quantity is the same for both gases. D. One does not know enough to compare the quantities.