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galben [10]
3 years ago
15

Planet a and planet b are in circular orbits around a distant star. planet a is 7.8 times farther from the star than is planet

Physics
1 answer:
gogolik [260]3 years ago
6 0
To find the ratio of planetary speeds Va/Vb we need the orbital velocity formula: 

V=√({G*M}/R), where G is the gravitational constant, M is the mass of the distant star and R is the distance of the planet from the star it is orbiting. 

So Va/Vb=[√( {G*M}/Ra) ] / [√( {G*M}/Rb) ], in our case Ra = 7.8*Rb 

Va/Vb=[ √( {G*M}/{7.8*Rb} ) ]  / [√( {G*M}/Rb )], we put everything under one square root by the rule: (√a) / (√b) = √(a/b) 

Va/Vb=√ [ { (G*M)/(7.8*Rb) } / { (G*M)/(Rb) } ], when we cancel out G, M and Rb we get:

Va/Vb=√(1/7.8)/(1/1)=√(1/7.8)=0.358 so the ratio of Va/Vb = 0.358.  
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allochka39001 [22]

Answer:

ni = 2.04e19

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we know that in semiconductor like intrinsic, when electron leave the band, it leave a hole in valence band so we have

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3 years ago
A bullet of mass m=26g is fired into a wooden block of mass M=4.7kg. The block is attached to a string of length 1.5m. The bulle
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Answer:

u = 449 m/s

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Using conservation of energy

(M+ m)gh = \dfrac{1}{2}(M+m)v^2

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3 years ago
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Answer:

F = 39.36 N

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force exerted by the ball is equal to 39.36 N.

5 0
3 years ago
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