Indietro
Problema 84c
Calculate to the correct number of significant figures. c. 4.005 × 74 × 0.007
Problema 84d
Calculate to the correct number of significant figures. d. 453 ÷ 2.031
Problema 86a
Calculate to the correct number of significant figures. a. 0.004 + 0.09879 b. 1239.3 + 9.73 + 3.42 c. 2.4 - 1.777
Problema 86d
Calculate to the correct number of significant figures. d. 532 + 7.3 - 48.523
Problema 88a
Calculate to the correct number of significant figures. a. [(1.7×106) / (2.63×105)] + 7.33 b. (568.99 - 232.1) / 5.3
Problema 88c
Calculate to the correct number of significant figures. c. (9443 + 45 - 9.9) × 8.1 × 106
Problema 88d
Calculate to the correct number of significant figures. d. (3.14 × 2.4367) - 2.34
Problema 89
A flask containing 11.7 mL of a liquid weighs 132.8 g with the liquid in the flask and 124.1 g when empty. Calculate the density of the liquid in g/mL to the correct number of significant digits.
Problema 94a
Perform each unit conversion. a. 1.4 in to mm
Problema 94b
Perform each unit conversion. b. 116 ft to cm
Problema 94c
Perform each unit conversion. c. 1845 kg to lb
Problema 94d
Perform each unit conversion. d. 815 yd to km
Problema 95
A runner wants to run 10.0 km. Her running pace is 7.5 mi per hour. How many minutes must she run?
Problema 96
A cyclist rides at an average speed of 18 mi per hour. If she wants to bike 212 km, how long (in hours) must she ride?
Problema 97
A certain European automobile has a gas mileage of 17 km/L. What is the gas mileage in miles per gallon?
Problema 98
A gas can holds 5.0 gal of gasoline. Express this quantity in cm3.
Problema 99a
A house has an area of 195 m2. What is its area in each unit? a. km2 b. dm2 c. cm2
Problema 99b
A house has an area of 195 m2. What is its area in each unit? a. km2 b. dm2 c. cm2
Problema 99c
A house has an area of 195 m2. What is its area in each unit? a. km2 b. dm2 c. cm2
Problema 100c
A bedroom has a volume of 115 m3. What is its volume in each unit? a. km3 b. dm3 c. cm3
Problema 101
The average U.S. farm occupies 435 acres. How many square miles is this? (1 acre = 43,560 ft2, 1 mile = 5280 ft)
Problema 102
Total U.S. farmland occupies 954 million acres. How many square miles is this? (1 acre = 43,560 ft2, 1 mi = 5280 ft). Total U.S. land area is 3.537 million square miles. What percentage of U.S. land is farmland?
Problema 103
An acetaminophen suspension for infants contains 80 mg/0.80 mL suspension. The recommended dose is 15 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 14 lb? (Assume two significant figures.)
Problema 104
An ibuprofen suspension for infants contains 100 mg/5.0 mL suspension. The recommended dose is 10 mg/kg body weight. How many mL of this suspension should be given to an infant weighing 18 lb? (Assume two significant figures.)
Problema 105
There are exactly 60 seconds in a minute, exactly 60 minutes in an hour, exactly 24 hours in a mean solar day, and 365.24 solar days in a solar year. How many seconds are in a solar year? Give your answer with the correct number of significant figures.
Problema 106
Determine the number of picoseconds in 2.0 hours.
Problema 107
Classify each property as intensive or extensive. a. volume b. boiling point c. temperature d. electrical conductivity e. energy
Problema 108
At what temperatures are the readings on the Fahrenheit and Celsius thermometers the same?
- Suppose you design a new thermometer called the X thermometer. On the X scale, the boiling point of water is 130 °X, and the freezing point of water is 10 °X. At what temperature are the readings on the Fahrenheit and X thermometers the same?
Problema 109
Problema 110
On a new Jekyll temperature scale, water freezes at 17 °J and boils at 97 °J. On another new temperature scale, the Hyde scale, water freezes at 0 °H and boils at 120 °H. If methyl alcohol boils at 84 °H, what is its boiling point on the Jekyll scale?