Aun automóvil de 15680 que se mueve a una velocidad de 20 m / s se le aplica una fuerza de 6,4 · 10 2n hasta que se detiene. a. ¿cuál es la masa del auto? b. ¿cuál era su cantidad de movimiento ( momento) inicial? ç c. ¿cuál fue el cambio en momento del auto? d. ¿cuánto tiempo se aplicó la fuerza? sol: a)1,6·103kg b)3,2·104 kgm/s c)3,2·104 kgm/s d)50s

-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

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laticia draws the diagram below to show earth’s magnetic field.

answer

the arrows to the right of earth should point up.

  the unit of the measure =

explanation:

  the property that is quantified by the energy needed per of material to raise the temperature by one.

  si unit of energy = joule (j)

  si unit of temperature = kelvin (k)

  si unit of mass of material = kilogram (kg)

the property that is quantified by the energy needed per of material to raise the temperature by one is called specific heat.

the unit of specific heat is