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2 years ago

7

One of the characteristics of the planet mars that makes it very different from earth is that it does not have a large magnetic

field. based on what you know about earth's magnetic field, what do you think is different about mars' interior?

2 answers:

Ket [755]2 years ago

8 0

Answer:

It is most likely solid.

Explanation:

kumpel [21]2 years ago

4 0

Answer:

It’s solid

Explanation:

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2 years ago

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Which energy output objects work with the turbine

viktelen [127]

Answer:

The energy output object that works with the turbine is the alternator (generator)

Explanation:

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3 years ago

Is it ever possible for the work done by friction to increase the kinetic energy of an object?

sweet-ann [11.9K]

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3 years ago

A cosmic ray (an electron or nucleus moving ar speeds close to the speed of light) travels across the Milky Way at a speed of 0.

Fiesta28 [93]

Answer:

Cosmic ray's frame of reference: 99,875 years

Stationary frame of reference: 501,891 years

Explanation:

First of all, we convert the distance from parsec into metres:

$d=30,000 pc =9.26\cdot 10^{20} m$

The speed of the cosmic ray is

$v=0.98 c$

where

$c=3.0 \cdot 10^8 m/s$ is the speed of light. Substituting,

$v=(0.98)(3.0\cdot 10^8)=2.94\cdot 10^8 m/s$

And so, the time taken to complete the journey in the cosmic's ray frame of reference (called proper time) is:

$T_0 = \frac{d}{v}=\frac{9.26\cdot 10^{20}}{2.94\cdot 10^8}=3.15\cdot 10^{12} s$

Converting into years,

$T_0 = \frac{3.15\cdot 10^{12}}{(365\cdot 24\cdot 60 \cdot 60}=99,875 years$

Instead, the time elapsed in the stationary frame of reference is given by Lorentz transformation:

$T=\frac{T_0}{\sqrt{1-(\frac{v}{c^2})^2}}$

And substituting v = 0.98c, we find:

$T=\frac{99,875}{\sqrt{1-(\frac{0.98c}{c})^2}}=501,891 years$

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3 years ago