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iogann1982 [59]
3 years ago
6

Will mark brainliest for the first person who answered correctly Where does geothermal energy come from? -Radioactive processes

in nuclear power stations. -Radioactive processes within the Earth. -The decay of organic material. -The movement of the tides.
Physics
2 answers:
egoroff_w [7]3 years ago
7 0

the answer is radioactive processes within the Earth.

Gennadij [26K]3 years ago
7 0

Answer:

Radioactive processes within the Earth.

Explanation:

many of Earth’s heat is constantly generated by the decay of radioactive isotopes, such as potassium-40 and thorium-232.

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A 103 kg physics professor has fallen into the Grand Canyon. Luckily, he managed to grab a branch and is now hanging 93 m below
siniylev [52]

Answer:

125.83672 seconds

Explanation:

P = Power of the horse = 1 hp = 746 W (as it is not given we have assumed the horse has the power of 1 hp)

m = Mass of professor = 103 kg

g = Acceleration due to gravity = 9.8 m/s²

h = Height of professor = 93 m

Work done would be equal to the potential energy

W=mgh\\\Rightarrow W=103\times 9.8\times 93\\\Rightarrow W=93874.2\ J

Power is given by

P=\frac{W}{t}\\\Rightarrow t=\frac{W}{P}\\\Rightarrow t=\frac{93874.2}{746}\\\Rightarrow t=125.83672\ seconds

The time taken by the horse to pull the professor is 125.83672 seconds

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Speed= Distance/Time
Distance=24m
Time= 5seconds
Speed= 24/5= 4.8m/s
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