In Ptolemy's geocentric model, retrograde motion occurs when the planet is closest to us, on the inside portion of the
A) ellipse. B) epicycle. C) equant. D) ecliptic. E) deferent.
B
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The type of EM waves used in radar is
a. ultraviolet. b. infrared. c. x-ray. d. microwave. e. blackbody.
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. It is then disconnected from the battery and the space between the plates is filled with a material of dielectric constant 3. After the dielectric is added, the magnitudes of the capacitance and the potential difference between the plates are
A.
C0, 
V0.B.
V0.C.
D.
V0.E.
Two systems are in thermal equilibrium. The two systems are at the same
A) pressure. B) volume. C) height. D) pressure and temperature. E) temperature.
Conduction: In an experiment to measure the thermal conductivity of a certain material, a slab of material 10.0 mm thick separates a steam chamber from a block of ice with a square cross-section with dimensions 8.00 cm × 8.00 cm. After 5.00 min of running the experiment, 64.0 g of ice have melted. What is the thermal conductivity of this material? The latent heat of fusion of water is 33.5 × 104 J/kg, the latent heat of vaporization of water is 2.256 × 106 J/kg, and both the ice and water are under 1.00 atm of pressure.
A. 0.130 W/m ? K B. 0.250 W/m ? K C. 0.440 W/m ? K D. 0.620 W/m ? K E. 1.12 W/m ? K