question about conversion?
1. You like 3 teaspoons of sugar and 1/4 cup of milk in each cup of coffee (3/4 cup coffee, 1/4 cup milk you drink). Before leaving for a trip you prepare a thermos that holds 2 quarts of liquid. What quantities of coffee, sugar and milk will you use? (Assume that sugar occupies no volume) Kitchen conversions: 1 quart=4cups; 1 cup=16tbsp; 1tbsp=3tsp.
2. The Voyager 2 mission to the outer planets of the solar system transmitted by radio signals many spectacular photographs of Neptune. Radio waves, like light waves, travel at a speed of 3.00 x 10^8 m/s. If Neptune was 2.75 billion miles from Earth during these transmissions, how many hours were required for radio signals to travel from Neptune to Earth? [use significant figures and scientific notation]
thermos that holds 2 quarts of liquid. which equals 8 cups
8 cups @ 3/4 coffee = 6 cups coffee
8 cups @ 1/4 milk = 2 cups milk
8 cups @ 3 tsp / cup = 24 tsp @ 1 Tblsp / 3 tsp = 8 Tblsp = 1/2 cup sugar
your answer is : 6 cups coffee, 2 cups milk, 1/2 cup sugar
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2.75 billion miles @ 1 609 meters / mile = 4.425 e12 metres
4.425 e12 metres @ 3.00 x 10^8 m/s = 14750 seconds
14750 seconds @ 1 hour / 3600 seconds = 4.097 hours
your answer (3 sig figs) : 4.10 hours
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