An ice-storage facility uses sawdust as an insulator. If the outside walls are 2 feet thick sawdust and the sideboard thermal conductivity is neglected, determine the R-Value of the walls. Then, if the inside temperature is 25ºF and the outside is 85ºF, estimate the heat gain of the storage facility per square foot of outside wall.
What will be an ideal response?
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Parallax is
a. the apparent motion of an object due to the motion of the observer. b. the distance between two foci of an ellipse. c. the small circle that the planets slid along in Ptolemy's geocentric universe. d. the circular orbits used in Copernicus' heliocentric universe. e. half the length of the shortest diameter of an ellipse.
A billiard ball traveling at 3.00 m/s collides perfectly elastically with an identical billiard ball initially at rest on the level table
The initially moving billiard ball deflects 30.0° from its original direction. What is the speed of the initially stationary billiard ball after the collision? A) 2.00 m/s B) 0.866 m/s C) 1.50 m/s D) 2.59 m/s E) 0.750 m/s
A 15-?F capacitor and a 25-?F capacitor are connected in parallel, and charged to a potential difference of 60 V. How much energy is then stored in this capacitor combination?
A. 50 mJ B. 18 mJ C. 32 mJ D. 72 mJ E. 45 mJ
What can you conclude about a Type I supernova?
A) It was originally a high-mass star. B) Its spectrum will show large amounts of hydrogen. C) It was originally a low-mass star. D) Its core was mostly iron. E) The star never reached the Chandrasekhar limit.