Read about Manny's investigation then answer the questions.
1. What is a benefit of Manny's electromagnet?
2. What are two things Manny could do to increase the strength of the electromagnetic force?
; 3. Look at the picture closely. What evidence is there that the electromagnet exerts a force on the
paper clips, even though they are not touching?
4. Many detaches the two wires from the battery and reattaches them to the opposite terminals.
Explain how this changes the current and magnetic field.
5. Suppose you pull the paperclips away from the nail. Explain how the potential energy between
the paperclips and the nail changes.

Explanation:

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-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

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.