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olganol [36]
2 years ago
8

Helpppppppppp meeeeeeeeeee plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz

Physics
1 answer:
borishaifa [10]2 years ago
3 0
It’s either A or C but most likely A
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Halley's comet orbits the sun roughly once every 76 years. It comes very close to the surface of the Sun on its closest approach
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Answer:

r1 = 5*10^10 m , r2 = 6*10^12 m

v1 = 9*10^4 m/s

From conservation of energy

K1 +U1 = K2 +U2

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0.5v1^2 - GM/r1 = 0.5v2^2 - GM/r2

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G = 6.67*10^-11 N.m^2/kg^2

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v2 = 5.35*10^4 m/s

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3 years ago
The sound wave passes from the sea-water into the air. State what happens to; the speed of the waves
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An engine has an energy input of 125j and 35 j of that energy is transformed into useful energy
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The engine's efficiency is (35J)/125J) = 28% .

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