ELEMENTARY PROBLEMS ABOUT WEATHER

WRITTEN EXERCISE

1. What is the difference in temperature between 4° below zero and the freezing point of water?

2. The average January temperature in Washington is 33°, in New York it is 10% less, and in Norfolk, Virginia, it is 20% more. What is it in each of these places?

3. The coldest temperature recorded by our weather bureau is in Poplar River, Montana, 63° below zero, while the lowest recorded at Key West, Florida, is 41° above What is the average of these two?

zero.

4. The highest temperature recorded at any station of our national weather bureau is 118°, at Yuma. Red Bluff, California, has come within 2.95% of it, and Boisé City, Idaho, within 7%. What is the highest temperature of these places?

5. The average velocity of the wind in Buffalo is 11 mi. per hour throughout the year. It is 18% less in Chicago, and is 22% less in Denver than in Chicago. What is the average velocity in each of these places?

6. The highest wind velocity ever known in San Francisco was 60 mi. per hour. Such a wind blows with a force of 17.712 lb. per square foot. What is its pressure on the side of a school building 100 ft. long and 40 ft. high?

7. The average annual precipitation (rainfall) in Vicksburg is 55.7 in., in Nashville it is 5.7 in. less, in Yuma, Arizona, it is only 6% as much as in Nashville, and in Duluth it is 1000% as much as in Yuma. What is the

precipitation in these various places?

It is often found to be helpful to keep records of the weather, illus

OUR ELECTRICITY INTERESTS

WRITTEN EXERCISE

1. If the number of miles of electric street railways

in a certain ten years from $19,000,000, how much was it at the end of the ten years?

3. If the value of the electrical apparatus produced in a certain year was $96,000,000, an increase in the ratio of 5 to 24 in ten years, what was it ten years before?

4. If the cost of running street cars in a city is 19 per mile by horse power, 17 by cable, and 13 by electricity, what per cent cheaper is it to run them by electricity than by horse power? than by cable?

5. If the average number of telephone calls per day in this country was 9,387,600 in a certain year, an increase of 20% over the preceding year, what was the total number of calls for all of the preceding year?

6. If it is 25,000 mi. around the earth, what was the ratio of the distance around the earth to the length of wire of the Bell Telephone Company when this company

3. Express as decimals: 3, 4, 25, 30, 25, 30, d.

4. Express as common fractions: 0.5, 0.6, 0.25, 0.40. 5. Express as an integer and a common fraction: 1.33}, 3.663, 5.75, 17.400, 32.125.

6. State the sums: 0.7 +0.8, 0.6 + 0.4, 0.9 + 0.7, 1.6 +2.4, 3.8+0.2, 5.9 +4.1, 3.25 +6.75.

7. Multiply: 0.5 × 0.5, 4 × 0.5, 0.3 × 6, 0.25 × 4, 0.01 x 50, 7 × 0.7, 0.01 x 0.01, 0.05 x 0.09.

8. Divide: 2.5 ÷ 5, 3.5 ÷ 7, 0.49 ÷ 7, 6.4 ÷ 8, 0.72 ÷ 9, 1.44 ÷ 12, 14.4 ÷ 12, 12.5 ÷ 5, 1.25 ÷ 5.

9. A foot is what decimal fraction of a yard? A quart is what decimal part of a gallon? of a peck?

10. Reduce 2 ft. 8 in. to inches; 2 lb. 8 oz. to ounces; 2 dollars and 8 cents to cents; 2 min. 8 sec. to seconds.

11. Reduce 36 in. to feet; 19 in. to feet and inches; 42 in. to yards and inches; 40 oz. to pounds and ounces.

12. State the sums: 3 ft. 8 in. + 4 ft. 4 in.; 2 ft. 9 in. +3 ft. 9 in.; 3 yd. 20 in. + 5 yd. 20 in.; 7 lb. 10 oz. + 2 lb. 6 oz.; 4 bu. 2 pk. +8 bu. 3 pk.

13. Subtract: 8 yd. 4 in. 15 oz.; 4 bu. 2 pk. -3 pk.; -1 yd. 2 ft.; 5 rd. 6 ft.

1 yd. 30 in.; 2 lb. 10 oz. 5 rd. 2 ft. - 34 ft.; 2 yd. 1 ft. 2 rd. 13 ft.

14. Multiply: 2 ft. 6 in. by 2; 3 ft. 4 in. by 3; 4 ft. 3 in. by 4; 1 ft. 8 in. by 2; 2 lb. 2 oz. by 8; 1 lb. 4 oz. by 5.

15. Divide: 8 lb. 4 oz. by 4; 10 lb. 10 oz. by 5; 9 ft. 6 in.

WRITTEN EXERCISE

First estimate the answer and write it down; then solve the problem and compare the answers (see page 88):

10. At 23g a yard, what will 83 yd. of ribbon cost? 11. At 18 a pound, what will 73 lb. of meat cost? 12. At 12 a yard, what will 18 yd. of cotton cost? 13. At $1.30 a yard, what will 27 yd. of cheviot cost? 14. At $2.30 a yard, what will 15 yd. of velvet cost? 15. At 24 a yard, what will 143 yd. of gingham cost? 16. If 73 yd. of velvet cost $12.40, what is the price per yard?

17. If a dealer pays $18.75 for 150 lb. of figs, what does he pay per pound?

18. A woman buys 34 lb. of coffee for $1.04. What does she pay per pound?

19. A train of cars goes 63.9 mi. in an hour and a half. What is its rate per hour?

20. A man pays $216 a year for the rent of his house. What is the rate per month?

21. A laundryman pays $5.40 for 160 cakes of soap. What does he pay per cake?

22. A dealer pays $33 a dozen for hats. At this rate, what does he pay for 50 hats?

23. If a dealer pays 28 a pound for a certain grade of cinnamon, at what price per ounce must he sell it to gain

ELEMENTARY PROBLEMS ABOUT WEATHER

WRITTEN EXERCISE

1. What is the difference in temperature between 4° below zero and the freezing point of water?

2. The average January temperature in Washington is 33°, in New York it is 10% less, and in Norfolk, Virginia, it is 20% more. What is it in each of these places?

3. The coldest temperature recorded by our weather bureau is in Poplar River, Montana, 63° below zero, while the lowest recorded at Key West, Florida, is 41° above What is the average of these two?

zero.

4. The highest temperature recorded at any station of our national weather bureau is 118°, at Yuma. Red Bluff, California, has come within 2.95% of it, and Boisé City, Idaho, within 7%. What is the highest temperature of these places?

5. The average velocity of the wind in Buffalo is 11 mi. per hour throughout the year. It is 18% less in Chicago, and is 223% less in Denver than in Chicago. What is the average velocity in each of these places?

6. The highest wind velocity ever known in San Francisco was 60 mi. per hour. Such a wind blows with a force of 17.712 lb. per square foot. What is its pressure on the side of a school building 100 ft. long and 40 ft. high?

7. The average annual precipitation (rainfall) in Vicksburg is 55.7 in., in Nashville it is 5.7 in. less, in Yuma, Arizona, it is only 6% as much as in Nashville, and in Duluth it is 1000% as much as in Yuma. What is the

precipitation in these various places?

It is often found to be helpful to keep records of the weather, illus