Sacramento State University



Sacramento State University PHYSICS 1 Fall 2007

Shea

HOMEWORK 2

1.You read in a thriller novel that the hero escapes with $250 million of gold and he carries it away in a suitcase. You think, is this possible? Do a calculation using standard unit conversion to satisfy your curiosity. That is what is the volume of the suitcase needed in m3 and the weight in lbs. of this much gold ( 1 troy ounce of gold has a mass of 28. 4 grams, the density of gold is 19.3 g/cm3 and the cost is approximately $705 per troy ounce). Be sure to discuss your results.

2. The gas mileage of your car is 26 mi./gal. What is it in Km/liter? A liter of gas costs about $2.40 in Europe. Estimate what it would cost you to fill up your car with gas in Europe.

3.A typical virus is a packet of protein and DNA and can be spherical in shape. The influenza virus has a typical diameter of 82 nm. If the volume of one of the small saliva drops that is coughed on you has a volume of 0.0320 cm3 and 10-7 % of this volume is estimated to be virus particles, use standard unit conversions showing all of your work, to find how many virus particles are in this saliva drop. Be sure to draw picture representations of the problem and explain your reasoning.

4. You go to Home Depot and buy a gallon of paint. On the can it says that this paint will cover approximately 750 Ft2 of wall area. Use this data to find the approximate thickness of the paint on the wall in mm to two significant figures. Be sure to draw a picture.

5. What is the percent uncertainty in the volume of a spherical ball whose radius is (3.52±0.07)cm? Using the max and min values the volume, show that the percent uncertainty of the volume is approximately 3 times the percent uncertainty of the radius.

[Note: % Uncertainty = 100(uncertainty in measured quantity)/ (magnitude of the quantity)]

Due Tuesday September 18

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