Consider a huge rotating cloud of particles in space that gravitate together to form an increasingly dense ball. as the cloud shrinks in size, it? a) rotates slower b) rotates faster c) rotates at the same rate

asteroids orbit the

during the peak of a total annular eclipse, the image of the sun cast onto some white paper is

a cloud of interstellar gas is held together by

about how deep is the photosphere?

because a white dwarf is no longer burning fuel, it is more accurately described as being a

a supercluster is a

a star's size stabilizes when

compared to most stellar objects, quasars are more

galaxies are aggregations of stars, stellar dust, and gas. their masses

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

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.