La distancia que separa al punto P del punto Q es 20 cm, mientras que la separación entre Q y R es 40 cm. Si el tiempo que tarda en viajar desde P hacia Q es 4 s, ¿cuál es la frecuencia de la onda en el medio 2? A) 0,5 Hz.
B) 1,0 Hz.
C) 2,0 Hz.
D) 4,0 Hz.
E) 8,0 Hz.

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

find the sum of the two horizontal vectors and the sum of the two vertical vectors

isoceles right angled triangle

a cold ice-tea.

pour in room temperature or cold water. cover the pitcher and refrigerate. steep white or green tea for 6 to 8 hours; steep black or oolong tea for 8 to 12 hours.jun 28, 2015