In this photo, the left side of a ceramic dish is ice-cold while the right side is very hot. What property of a ceramic, at the atomic/molecular level, would make it a poor heat conductor compared with a copper dish?
a. Ceramics fall apart at high temperatures.
b. Only colliding and vibrating atoms transfer their motion to each other and cause conduction.
c. The electrons in the ceramic, which is an electrical insulator, are not as free to move over large distances to help transfer thermal energy.
d. Only electrons that conduct electric current can transfer energy and cause heat conduction.
e. Only metals conduct heat.
c
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The occasional backward motion of the planets against the background of fixed stars is called _____
A) anterograde motion B) rotation C) oscillation D) retrograde motion
Kepler's Laws: It takes the planet Jupiter 12 years to orbit the sun once in a nearly circular orbit. Assuming that Jupiter's orbit is truly circular, what is the distance from Jupiter to the sun, given that the distance from the earth to the sun is 1.5 × 1011 m?
A. 3.9 × 1011 m B. 5.2 × 1011 m C. 7.9 × 1011 m D. 9.7 × 1011 m E. 3.2 × 1012 m
An ideal spring with a force constant (spring constant) of 15 N/m is initially compressed by 3.0 cm from its uncompressed position. How much work is required to compress the spring an additional 4.0 cm?
A) 0.024 J B) 0.030 J C) 0.012 J D) 0.0068 J
Outside a spherically symmetric charge distribution of net charge Q, Gauss's law can be used to show that the electric field at a given distance
A) must be zero. B) must be directed outward. C) acts like it originated in a point charge Q at the center of the distribution. D) must be directed inward. E) must be greater than zero.