3 years ago

What is the main reason why people use machines

Physics

2 answers:

Butoxors [25]3 years ago

5 0

Answer:

Machines are faster and more efficent

Explanation:

vova2212 [387]3 years ago

3 0

Answer: Machines makes work easier and save some time and is very fast. For example, an elder can't walk or stand very long, so people made a motorized wheelchair!

Explanation:

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A car is initially moving at 20 m/s east and a little while later it is moving at 10 m/s north. Which of the following best desc

Nina [5.8K]

Answer:d

Explanation:

Given

First car is moving towards east with velocity 20 m/s

$\vec{v_1}=20\hat{i}$

then it turns towards north then velocity is

$\vec{v_2}=10\hat{j}$

suppose car takes t sec to change its path so average acceleration is given by

$a=\frac{v_2-v_1}{t}$

$a=\frac{1}{t}(10\hat{j}-20\hat{i})$

So average acceleration is towards North of west.

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Angelina_Jolie [31]

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3 years ago

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kvasek [131]

Answer:

C. 1500.

Explanation:

750 / .5 = 1500.

Hope this helps & best of luck!

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3 years ago

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denis-greek [22]

Answer:

No, it's not there.

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For a machine to be 100% efficient, it has to be with an output which is equal to its input. But machines have an out put less than an input, hence efficiency below 100%.

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3 years ago