A picture of a person pulling a sled by a rope at an angle. A child is sitting on the sled. A free body diagram with 5 force vectors. The first vector is pointing downward, labeled F Subscript g Baseline = 58.8 N. The second vector is pointing right, labeled F Subscript f Baseline = 1.5 N. The third vector is pointing upward. The fourth vector is pointing left, labeled F Subscript p x Baseline. The fifth vector is pointing up to the left at an angle of 30 degrees, labeled F Subscript p Baseline = 10 N. The upward vector is shorter than the downward vector. The right vector is shorter than the left vector. Another vector starts at the tip of the left vector and points up to the tip of the 30 degree vector using the tip to tail method. The force diagram represents a girl pulling a sled with a mass of 6.0 kg to the left with a force of 10.0 N at a 30.0 degree angle. There is a 1.5 N force of friction to the right. The force of gravity is 58.8 N. What is the normal force acting on the sled? Round the answer to the nearest whole number. N What is acceleration of the sled? Round the answer to the nearest tenth. m/s2

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

powerful computers now, not then

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

-in the summer, the process is reversed, and the heat pump moves heat from the indoor air into the heat exchanger

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