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3 years ago

Which two statements about composite materials are true?

Physics

1 answer:

Lostsunrise [7]3 years ago

4 0

Answer:

Here down below is 3 things true about composite materials

Explanation:

-They’re made up of more than one substance.

-They have the same or similar properties as the materials used to make them.

-They’re always made of metal.

-They’re readily available in nature.

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When have you experienced an increase in kinetic<br> energy within a system?

Mars2501 [29]

Answer:

If a man starts running on a boat with an acceleration a with respect to the boat, there is no external force that acts on the Boat+Man system

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3 years ago

Which method is responsible for the transfer of heat in the atmosphere ?

k0ka [10]

Answer:

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3 years ago

What transfer of energy is occurring between magnetism and electricity

ioda

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4 years ago

A constant friction force of 25 Nacts on a 65 kg skier for 20

Radda [10]

Answer:

The skier's change in velocity is 7.69 meters per second.

Explanation:

The Newton's second law tells force is equal to the change on the linear momentum of a body:

$\sum\overrightarrow{F}=\frac{d\overrightarrow{p}}{dt}$

If we approximate the differential $\frac{d\overrightarrow{p}}{dt}$ to $\frac{\Delta\overrightarrow{p}}{\Delta t}$ :

$\sum\overrightarrow{F}=\frac{\Delta\overrightarrow{p}}{\Delta t}$

Using that linear momentum is mass times velocity:

$\sum\overrightarrow{F}=\frac{m\Delta\overrightarrow{v}}{\Delta t}$

Solving for $\Delta\overrightarrow{v}$ :

$\Delta\overrightarrow{v}=\frac{\Delta t\sum\overrightarrow{F}}{m}=\frac{(20\,s)(25\,N)}{65\,kg}$

$\Delta\overrightarrow{v}=7.69\,\frac{m}{s}$

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3 years ago

You walk 45m west then 35m west

Nat2105 [25]

And walk another 25m west

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3 years ago