Essential University Physics (3rd Edition)
3rd Edition
ISBN: 9780134202709
Author: Richard Wolfson
Publisher: PEARSON
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Chapter 1, Problem 49P
Bubble gum’s density is about 1 g/cm3. You blow an 8-g wad of gum into a bubble 10 cm in diameter. What’s the bubble’s thickness? (Hint: Think about spreading the bubble into a flat sheet. The surface area of a sphere is 4πr2.)
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Paperweight
I bought a pack of 100 rectangular index cards. Each card measured 15 by 10 cm. The pack said ：Paper Density = 200 GSM (grams per square meter). This means that a square meter of those cards weighs 200 g.
A) All of the cards in the pack are place flat on a table without overlap. In square meters, what is the total area of the table covered by the cards?
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C) The total weight of 500 identical sheets of paper is 2.4kg. If each sheet measures 30cm by 20cm, what is its paper density in GSM?
D) A business card measures 55mm by 90mm. Its paper density is 300 GSM. Fins its exact weight in grams.
The density of bubble gum is about 1g/cm3. You blow an 8g wad of gum into a bubble 9cm in diameter. What is the thickness of the bubble? Use the equation: 4πr2 to help solve the problem.
One mole of Gold (Au) atom has a mass of 197 g. We know that the density of gold is 19.30 g/cm3 in room temperature. Using those numbers, answer the following questions:
a) What is the mass of a single gold atom in kg?
b) Assume that gold atoms sit in a perfect cubic crystal structure. Estimate the distance between two gold atoms in meters.
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d) What would be the mass, in kilograms, of the gold cube we discussed in part (c) (measuring 6 cm on each side)?
Chapter 1 Solutions
Essential University Physics (3rd Edition)
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