Pierre Curie did an experiment and strapped a tube of radium to his arm for a long period of time. When lesions formed and it was discovered that radium could harm healthy tissue, they wondered if it might destroy diseased tissue. Radioactive sources were inserted into the body or strapped to the surface. This was named-

Radioactive therapy

Explanation:

Radioactive materials were believed to have medicinal properties like having antibacterial effect and ability to cure a wide range of ailment. Radioactive therapy was marketed with the idea that humans had a high tolerance level for the radioactivity. It was not until research showed that the tolerance level was very much lower than thought, and the lethal side effects of radioactivity understood, that radioactivity was seen as highly dangerous, and handled with extreme caution and precautions.

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s

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