Conduction: A rod, with sides insulated to prevent heat loss, has one end immersed in boiling water at 100°C and the other end in a water-ice mixture at 0°C. The rod has uniform cross-sectional area 7.05 cm2 and length 87 cm. The heat conducted by the rod melts the ice at a rate of 1.0 g every 11 seconds. What is the thermal conductivity of the rod? Recall that the heat of fusion of water is 3.34 × 105 J/kg.
Fill in the blank(s) with the appropriate word(s).
370 W/m ?°C
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Accelerating electric charges give rise to electromagnetic waves
Indicate whether the statement is true or false
Significant Figures: In the difference A - B - C, A is accurate to 5 decimal places, B is accurate to 2 decimal places, and C is accurate to 3 decimal places. What is the correct number of decimal places in the difference?
A. 2 B. 3 C. 4 D. 5 E. 0
The chemical abundance of population I stars
a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.
We know that Earth has water. However, according to our theory of solar system formation, the inner solar system was too hot for hydrogen compounds like water to condense. What do we conclude?
A) Water arrived on Earth at a time when it rained throughout the inner solar system. B) Earth's water likely was brought here by asteroids or comets that formed beyond the frost line. C) Our theory of solar system formation will need modification because it is unable to account for the existence of water on Earth. D) Earth's water probably originated through chemical reactions among the rock and metal of Earth's interior.