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Tatiana [17]
3 years ago
8

Jacques is trying to put a screw into a hard piece of wood, but it is too difficult for him to turn. Which of the following woul

d increase the mechanical advantage of the screw?
A.using a screw with threads closer together
B.using a screw with threads further apart
C.using a screw with a larger head
D.using a screw with a smaller head
Physics
1 answer:
solniwko [45]3 years ago
3 0

Answer:

A. It is the only one that makes sense

Explanation:

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You are observing a spacecraft moving in a circular orbit of radius 100,000 km around a distant planet. You happen to be located
Natalija [7]

To solve this problem we will apply the concepts related to centripetal acceleration, which will be the same - by balance - to the force of gravity on the body. To find this acceleration we must first find the orbital velocity through the Doppler formulas for the given periodic signals. In this way:

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Here,

v_{o} =  Orbital Velocity

\lambda_{max} = Maximal Wavelength

\bar{\lambda}} = Average Wavelength

c = Speed of light

Replacing with our values we have that,

v_{o} = (3*10^5) (\frac{3.00036-3}{3})

<em>Note that the average signal is 3.000000m</em>

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Now using the definition about centripetal acceleration we have,

a_c = \frac{v^2}{r}

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v = Orbit Velocity

r = Radius of Orbit

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a = \frac{(36km/s)^2}{100000km}

a= 0.01296km/s^2

a = 12.96m/s^2

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a =\frac{GM}{r^2}

Here,

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The acceleration due to gravity is the same as the previous centripetal acceleration by equilibrium, then rearranging to find the mass we have,

M = \frac{ar^2}{G}

M = \frac{(12.96)(100000000)^2}{ 6.67*10^{-11}}

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Therefore the mass of the planet is 1.943028*10^{27}kg

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