Junior ScienceB.H. Sanborn, 1921 - 533 σελίδες |
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Σελίδα xiv
... Sounds We Hear CHAPTER XXVIII What causes a sound ? an echo ? How do we hear ? What causes What is the difference between noise and tone ? What are the classes of musical instruments ? - How does a telephone carry sound ? - Exercises ...
... Sounds We Hear CHAPTER XXVIII What causes a sound ? an echo ? How do we hear ? What causes What is the difference between noise and tone ? What are the classes of musical instruments ? - How does a telephone carry sound ? - Exercises ...
Σελίδα 3
... sound , light , and electricity are , why we have eclipses of the sun and the moon , what lightning is , how soil is formed , why grass is green , how we are nourished by our food ? There seems to be no end to the questions you can ask ...
... sound , light , and electricity are , why we have eclipses of the sun and the moon , what lightning is , how soil is formed , why grass is green , how we are nourished by our food ? There seems to be no end to the questions you can ask ...
Σελίδα 9
... sound mind in a sound body " ; we should study it to learn how to live long and useful lives . 6. What We Have Learned . - Science begins with common - sense answers to questions regarding nature . Nature includes objects and phenomena ...
... sound mind in a sound body " ; we should study it to learn how to live long and useful lives . 6. What We Have Learned . - Science begins with common - sense answers to questions regarding nature . Nature includes objects and phenomena ...
Σελίδα 87
... sound travels more , or less , rapidly than light ? Tornadoes , or " twisters " ( Fig . 54 ) , are whirling masses of air from 50 feet to half a mile in diameter . The air pressure at the center may be as low as 7 or 8 pounds to the ...
... sound travels more , or less , rapidly than light ? Tornadoes , or " twisters " ( Fig . 54 ) , are whirling masses of air from 50 feet to half a mile in diameter . The air pressure at the center may be as low as 7 or 8 pounds to the ...
Σελίδα 263
... sound . Electromagnet Spring Dry Cell Push Button FIG . 150. The electric - bell is rung by an electro- magnet which draws the hammer to the bell when the circuit is complete . The spring throws the hammer back as soon as the circuit At ...
... sound . Electromagnet Spring Dry Cell Push Button FIG . 150. The electric - bell is rung by an electro- magnet which draws the hammer to the bell when the circuit is complete . The spring throws the hammer back as soon as the circuit At ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acid ammonia animals bacteria becomes blood body boiling bones bottle breathing bulb burning called candle carbon dioxide carry cause cells cerebrum changed cloth coal cold color cool copper covered digestive dish dry cell earth electric current epidermis evaporate feet fire flame force give glass grow heat hydrochloric acid hydrogen inside iron kerosene kerosene lamp lamp layers learned light rays limewater liquid lungs machine magnet manganese dioxide material melted metal milk moon mouth move muscles needle nerve nitrogen nonconductor object oxide oxygen pass phosphorus piece pipes plants pole potassium chlorate pounds pressure produce pull pump push rock rubbed sal ammoniac salt seeds skin soil solution starch steam stomata stove substances sugar sulphur sunlight surface temperature tissue trees tube vibrations warm weather weight wind wire wood yeast zinc
Δημοφιλή αποσπάσματα
Σελίδα 509 - Measures of Weight 10 milligrams (mg) =1 centigram eg 10 centigrams =1 decigram dg 10 decigrams =1 gram g 10 grams =1 dekagram Dg 10 dekagrams =1 hektogram Hg 10 hektograms =1 kilogram Kg...
Σελίδα 402 - THIS is the forest primeval. The murmuring pines and the hemlocks, Bearded with moss, and in garments green, indistinct in the twilight, Stand like Druids of old, with voices sad and prophetic, Stand like harpers hoar, with beards that rest on their bosoms...
Σελίδα 509 - Measures of Length 10 millimeters (mm.) . . . . =1 centimeter cm. 10 centimeters =1 decimeter dm: 10 decimeters =1 meter m. 10 meters =1 dekameter Dm. 10 dekameters =1 hektometer Hm. 10 hektometers =1 kilometer Km.
Σελίδα 509 - Area. 100 square millimeters (sq. mm.) =1 sq. centimeter (sq. cm.). 100 square centimeters = 1 sq. decimeter (sq. dm.). 100 square decimeters =1 sq. meter (sq. m.). 3. Cubic Measure, or Volume. The unit of volume is the liter, which is 1 cu. dm., or 1,000 cc 1,000 cubic millimeters (cu. mm.) = 1 cubic centimeter (cc). 1,000 cubic centimeters =1 cubic decimeter (cu. dm.). 1 cubic decimeter = 1 liter (1.). 10 liters =1 dekaliter (dl.). 10 dekaliters =1 hectoliter (hl.). 10 hectoliters = 1 kiloliter...
Σελίδα 105 - The known principal planets, in order of their distance from the Sun are: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto.
Σελίδα 339 - Levers are divided into three classes: in the first class, the fulcrum ' is between the power and the weight ; in the second class, the fulcrum is...
Σελίδα 86 - The wind arrows show the wind to be moving in a direction opposite to the movement of the hands of a watch (counterclockwise) when it is laid, face up, on the map.
Σελίδα 243 - ... north pole of one magnet will attract the south pole of another, and the south pole of one will attract the north of another ; but the north...
Σελίδα 53 - The oxygen is carried by the blood to all parts of the body...
Σελίδα 331 - In the second class of levers th'e fulcrum is at one end and the power at the other, with the weight between them.