The value of δe for a system that performs 168 kj of work on its surroundings and loses 79 kj of heat is kj.

- 247 kJ

Explanation:

The formula you need to now is very simple:

ΔE = Q + W

This basically means that in order to calculate ΔE, you need to now the heat Q that the system loses or gains, and the work W that it perfoms or receives.

The system that we have loses heat, so Q is negative, and performs a work, which consumes energy, therefore W is also negative. So, in conclusion, we have:

ΔE = Q + W = -79 kJ - 168kJ = - 247 kJ.

The system loses 247 kJ of energy.

so here is the information for current research:

-nrel's geothermal analysts, scientists, and engineers perform a full range of research from developing advanced methods of locating and accessing geothermal resources to exploring innovative technologies to extract and produce clean energy from the heat of the earth

and here is the information for the technology of geothermal energy:

-it's clean and sustainable

-resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the earth's surface, and down even deeper to the extremely high temperatures of molten rock called magma

-almost everywhere, the shallow ground or upper 10 feet of the earth's surface maintains a nearly constant temperature between 50° and 60°f (10° and 16°c)

-geothermal heat pumps can tap into this resource to heat and cool buildings

-a geothermal heat pump system consists of a heat pump, an air delivery system (ductwork), and a heat exchanger-a system of pipes buried in the shallow ground near the building

-in the winter, the heat pump removes heat from the heat exchanger and pumps it into the indoor air delivery system

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-the heat removed from the indoor air during the summer can also be used to provide a free source of hot water

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000