21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 8.3, Problem 8.3ACYU
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7. When equal masses of two substances are
mixed, the resultant density is 2.5 g/cm3. When
equal volumes are mixed, the resultant density is
4.5 g/cm3. What are the densities of the two
substances?
# 3) There are a 3cm x 3cm x 3cm cube of gold and a 3cm x 3cm x 3cm cube of aluminum. The density of
gold is 19.3 g/cm³ and the density of aluminum is 2.7 g/cm³. Which has a larger mass and what is that
mass?
1. Gold is sold by the troy ounce (31.103 g). What is the volume of 1 troy ounce of pure
gold? (you'll need to use table 11.1, found in chapter 11.2 in the text) (1.610 cm3)
Chapter 8 Solutions
21st Century Astronomy
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3ACYUCh. 8.3 - Prob. 8.3BCYUCh. 8.4 - Prob. 8.4CYUCh. 8.5 - Prob. 8.5CYUCh. 8.6 - Prob. 8.6CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
Ch. 8 - Prob. 4QPCh. 8 - Prob. 5QPCh. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Prob. 8QPCh. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - Prob. 12QPCh. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Prob. 16QPCh. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - Prob. 19QPCh. 8 - Prob. 20QPCh. 8 - Prob. 21QPCh. 8 - Prob. 22QPCh. 8 - Prob. 23QPCh. 8 - Prob. 24QPCh. 8 - Prob. 25QPCh. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Prob. 34QPCh. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Prob. 38QPCh. 8 - Prob. 39QPCh. 8 - Prob. 40QPCh. 8 - Prob. 41QPCh. 8 - Prob. 42QPCh. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QP
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- A major artery with a cross-sectional area of 1.00 cm2 branches into 18 smaller arteries, each with an average cross-sectional area of 0.400 cm2. By what factor is the average velocity of the blood reduced when it passes into these branches?arrow_forwardOne gallon of paint (volume = 3.79 103 m3) covers an area of 25.0 m2. What is the thickness of the fresh paint on the wall?arrow_forwardIron has a density of 7.86 g/cm³. The volume occupied by 55.85 g of iron is A) 7.11 cm³. B) 2.8 cm3. C) None of the above. D) 439 cm³. E) 0.141 cm3.arrow_forward
- In the figure below, the actual mass of a piece of an alloy is 85 g (mass in air) and an apparent mass of 73 g ("mass" in water). What is its density? a. 5.6 x 10^3 kg/m^3.b. 5.8 x 10^3 kg/m^3.c. 6.2 x 10^3 kg/m^3.d. 6.6 x 10^3 kg/m^3.e. 7.3 x 10^3 kg/m^3.arrow_forward5.If I change the shape of the clay, its weight and volume also change. O A. True O B. Falsearrow_forward1.What is the volume occupied by a kilogram of gold? (Recall that ρgold =2×104kg/m−3.) A. 5×10−3 m3 B. 2×104 m3 C. 5×10−5 m3 D. 5×10−4 m3 2. The pressure of ocean water increases as the water A. gets closer to shore B. becomes deeper C. gets shallower D. two of the abovearrow_forward
- 3) Gold is a very dense metal with a density of 19.3 g/cm3, what is the volume of a 0.255 kg gold sample? (Answer = 13.2 cm3). Equality 1: g = kg Equality 2: g = cm3 0.255 kg xarrow_forward1. What is the smallest number of whole logs (density used to build a raft that will carry 6 people, each of whom has a mass of 77.0 kg? = 725 kg/m3, radius = 0.079 m, length 3.21 m) that can be kpiarrow_forward1.If 400 kg of methylated spirit occupies volume of 0.50 m, what is its density? a) 8 x102 kgm-3 b) 8 x10-2 kgm3 c)2 x10-2 kgm-3 d) 1.25 x10-3 kgm-3 2. A slice of bread is squeezed into a little ball. Which quantity does NOT change? a) mass b)volume c) density d) width 3. The relative density of brass is 8.4. Which of the following is the best statement that can be made? a) Brass is heavier than water. b) Water is heavier than brass. c) 100 cm of brass is heavier than 100 cm of water. d) 100 cm of water is heavier than 100 cm' of brass.arrow_forward
- 10.Cutting a wood in half will also make its density half of the original density. O A. True O B. Falsearrow_forward5. Copper can be drawn into thin wires. How many meters of 34- gauge wire (diameter=6.30x10-3 in) can be produced from the copper in 4.010 lb of covellite, an ore of copper that is 66.00% copper by mass? (Hint: treat the wire as a cylinder: V of cylinder V=nr?h; density of copper = 8.95 g/cm3) Include units in your answer 1. 3.34 x 103 m 2. 4.89 x 103 m 3. 6.66 x 103 m 4. 8.57 x 103 m.arrow_forward11) Seawater contains approximately 3.5% salt by weight, what is the of the seawater containing 3 kg of salt if the density of the seawater is equal to 1030kg/cm³arrow_forward
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