physics hws

physics hws - 1[HRW8 1.P.001 3/3 points Last Response |...

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Unformatted text preview: 1. [HRW8 1.P.001.] 3/3 points Last Response | Show Details All Responses Notes The micrometer (1 µm) is often called the "micron." (a) How many microns make up 4.0 km? 4.0e9 4.00e+09 µm (b) What fraction of a centimeter equals 3.0 µm? 3e-4 0.0003 (c) How many microns are in 2.0 yd? 1828800 1.83e+06 µm Section 1-5 2. [HRW8 1.P.005.] 3/3 points Last Response | Show Details All Responses Notes Jupiter is approximately a sphere of radius 6.99 x 10 7 m. (a) What is its circumference in kilometers? 439194.653 4.39e+05 km (b) What is its surface area in square kilometers? 6.1399e10 6.14e+10 km 2 (c) What is its volume in cubic kilometers? 1.4306e15 1.43e+15 km 3 Section 1-5 3. [HRW8 1.P.007.] 1/1 points Last Response | Show Details All Responses Notes Antarctica is roughly semicircular, with a radius of about r = 1900 km. The average thickness of its ice cover is about h = 3100 m. How many cubic centimeters of ice does Antarctica contain? (Ignore the curvature of Earth.) 1.7578e22 1.76e+22 cm 3 Section 1-5 4. [HRW8 1.P.009.] 1/1 points Last Response | Show Details All Responses Notes Hydraulic engineers often use, as a unit of volume of water, the "acre-foot", defined as the volume of water that will cover 1 acre of land to a depth of 1 ft. A severe thunderstorm dumps 1.9 in. of rain in 30 min on a town of area 32 km 2 . What volume of water, in acre-feet, fell on the town?| 1266.666 1250 acre-feet Section 1-5 5. [HRW8 1.P.020.] --/2 points No Response | Show Details Notes Gold, which has a mass of 19.32 g for each cubic centimeter of volume, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long fiber. (a) If a sample of gold, with a mass of 27.63 g, is pressed into a leaf of 2.500 µm thickness, what is the area of the leaf? (No Response) 0.5720 m 2 (b) If, instead, the gold is drawn out into a cylindrical fiber of radius 3.500 µm, what is the length of the fiber? (No Response) 3.716e+04 m Section 1-7 6. [HRW8 1.P.021.] 2/2 points Last Response | Show Details All Responses Notes (a) Assuming that water has a density of exactly 1 g/cm 3 , find the mass of 1.85 cubic meter of water in kilograms. 1850 1850 kg (b) Suppose that it takes 10.0 h to drain a container of 4650 m 3 of water. What is the "mass flow rate," in kilograms per second, of water from the container? 129.1666 129 kg/s Section 1-7 7. [HRW8 1.P.023.] 0/1 points Last Response | Show Details All Responses Notes The Earth has a mass of 5.98 10 24 kg. The average mass of the atoms that make up the Earth is about 42 u. Based on this average mass, how many atoms are in the Earth? 1.4238e32 8.57e+49 atoms Section 1-7 8. [HRW8 1.P.024.] 0/6 points Last Response | Show Details All Responses Notes A cubic centimeter in a typical cumulus cloud contains 50 to 500 water drops, which have a typical radius of 10 µm. For that range, give the lower value and the higher value, respectively, for the following....
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This note was uploaded on 04/07/2008 for the course PHYS 1100 taught by Professor Giomanico during the Spring '08 term at LSU.

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physics hws - 1[HRW8 1.P.001 3/3 points Last Response |...

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