Problem 78
How many significant digits are in the following unit factors? (a) \(1 \mathrm{~m} / 10 \mathrm{dm}\) (b) \(1 \mathrm{lb} / 454 \mathrm{~g}\) (c) \(1 \mathrm{~L} / 1000 \mathrm{~mL}\) (d) \(1 \mathrm{qt} / 946 \mathrm{~mL}\)
Problem 79
An automobile airbag inflates in \(35 \mathrm{~ms}\). What is the time of inflation in microseconds?
Problem 80
An automobile antilock brake system (ABS) operates the brakes at 30 pulses per second. How many times do the brakes pulse in \(1.00 \mathrm{ds} ?\)
Problem 81
A light year is the distance light travels in 1.00 year. Given the velocity of light, \(1.86 \times 10^{5} \mathrm{mi} / \mathrm{s}\), how many miles does light travel in a light year?
Problem 82
A parsec is the distance light travels in 3.26 years. Given the velocity of light, \(3.00 \times 10^{8} \mathrm{~m} / \mathrm{s}\), how many kilometers does light travel in a parsec?
Problem 85
Olympic athletes compete in a 1500-meter event, but not in a mile event. Which race is shorter: 1500 meters or 1 mile? (Given: \(1 \mathrm{mi}=1.61 \mathrm{~km}\).
Problem 86
An oxygen molecule travels 975 miles per hour at room temperature. What is the velocity in meters per second? (Given: \(1 \mathrm{mi}=1.61 \mathrm{~km})\).
Problem 87
How many \(325-\mathrm{mg}\) tablets can be produced from \(2.50 \mathrm{~kg}\) of powdered aspirin?
Problem 88
How many molecules are in one drop of water if \(1.00 \mathrm{~g}\) of water contains \(3.34 \times 10^{22}\) molecules? (Given: \(1 \mathrm{~mL}=20\) drops)
Problem 89
What is the density of a metal sample if a \(37.51-\mathrm{g}\) sample placed into a graduated cylinder increased the liquid level from \(50.0 \mathrm{~mL}\) to \(57.5 \mathrm{~mL} ?\)
