1. The particle of dust has a mass of
7.53 x kilograms. Find the weight of 5 billion dust particles.

2. ANSWER: 3.765 kg The particle of dust has a mass of
7.53 x kilograms. Find the weight of 5 billion dust particles.

3. The distance from the sun to the Andromeda galaxy is 1. 2 x 1019 miles
The distance from the sun to the Andromeda galaxy is 1.2 x 1019 miles. Light travels at a speed of 5.88 x 1012 miles per year (called a light-year). How long does it take light to travel from the sun to the Andromeda galaxy?

4. ANSWER: x 106
The distance from the sun to the Andromeda galaxy is 1.2 x 1019 miles. Light travels at a speed of 5.88 x 1012 miles per year (called a light-year). How long does it take light to travel from the sun to the Andromeda galaxy?

5. The mass of the sun is 1. 989 x 1030 kilograms
The mass of the sun is x 1030 kilograms. The mass of the earth is 5.98 x 1024
kilograms. How many times bigger is the sun than the earth?

6. ANSWER: 3.3 x 105
The mass of the sun is x 1030 kilograms. The mass of the earth is 5.98 x 1024
kilograms. How many times bigger is the sun than the earth?

7. There are 3. 4 x 109 particles of dust per cubic meter
There are 3.4 x 109 particles of dust per cubic meter. How many particles are there in a room that is 1200 cubic meters?

8. ANSWER: x 1012
There are 3.4 x 109 particles of dust per cubic meter. How many particles are there in a room that is 1200 cubic meters?

9. There are approximately 3. 1 x 108 people in the United States
There are approximately 3.1 x 108 people in the United States. If on average each person has 4.1 x 101 coins lying around on dressers, in pockets, in cars, etc., how many total coins do all the people in the U.S. have?

10. ANSWERL x 1010
There are approximately 3.1 x 108 people in the United States. If on average each person has 4.1 x 101 coins lying around on dressers, in pockets, in cars, etc., how many total coins do all the people in the U.S. have?

11. Last month, my friend bought a computer. If it can perform 4
Last month, my friend bought a computer. If it can perform 4.66 x 108 calculations per second, what is the performance of the computer in one minute?

12. ANSWER: x 1010
Last month, my friend bought a computer. If it can perform 4.66 x 108 calculations per second, what is the performance of the computer in one DAY?

13. If the speed of light is 3 x 108 meters/second, how many seconds does it take light to reach the Earth, if the sun is 1.5 x 1011 meters from Earth? Write the answer in scientific notation

14. ANSWER: 500 seconds
If the speed of light is 3 x 108 meters/second, how many seconds does it take light to reach the Earth, if the sun is 1.5 x 1011 meters from Earth? Write the answer in scientific notation

15. The size of the Indian Ocean is 2. 7 x 107 square miles
The size of the Indian Ocean is 2.7 x 107 square miles. The Arctic Ocean is 1/5 the size of the Indian Ocean. How big is the Arctic Ocean?

16. ANSWER: 5.4 x 106
The size of the Indian Ocean is 2.7 x 107 square miles. The Arctic Ocean is 1/5 the size of the Indian Ocean. How big is the Arctic Ocean?

17. The length of a rectangle is 3. 1 x 103 ft. The area is 1
The length of a rectangle is 3.1 x 103 ft. The area is x 106 square feet. What is the width? Give your answer in scientific notation.

18. 4.6 x 102
The length of a rectangle is 3.1 x 103 ft. The area is x 106 square feet. What is the width? Give your answer in scientific notation.

19. The population of the United States is 3
The population of the United States is 3.1 x 108 and the population of the world is 7.2 x How many times larger is the population of the world than the U.S.?

20. ANSWER: 23 times
The population of the United States is 3.1 x 108 and the population of the world is 7.2 x How many times larger is the population of the world than the U.S.?

21. The half-life of uranium–238 is years
The half-life of uranium–238 is years. The half-life of uranium-234 is years. How many times greater is the half-life of uranium-238 than that of uranium-234?