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4 years ago

¿Por qué si cargas a uno de tus compañeros por cierto tiempo no estás realizando un trabajo mecánico?

Physics

1 answer:

VladimirAG [237]4 years ago

4 0

Answer:

I will answer this in English, we can translate it to:

Why if you charge a mate by an amount of time you are not doing work?

This happens because work is defined as the displacement done by a force:

W = d*F

where W is work, d is the distance, and F is the force.

This means that the amount of time that you are charging your mate does not affect the mechanical work, the only time that you are doing work is when you are lifting him.

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Which three forms of light are invisible light?

Flauer [41]

Radio waves
infrared
x-rays
and red and blue light are not a thing, their on a color spectrum called visible light.

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3 years ago

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Which of the following can be contracted from contact with bloodborne pathogens?

sergij07 [2.7K]

HIV can be contracted from contact with bloodborne pathogens.

Other bloodborne diseases are HBV, malaria, syphilis and brucellosis

<h3>What are bloodborne pathogens?</h3>

Bloodborne pathogens can be defined as those microorganisms or pathogenic organisms that cause disease and are present in human blood.

Blood borne pathogens can also be contacted through the following means

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In conclusion; HIV can be contracted from contact with bloodborne pathogens.

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2 years ago

A purse at radius 2.30 m and a wallet at radius 3.45 m travel in uniform circular motion on the floor of a merry-go-round as the

ivolga24 [154]

Answer:

The acceleration of the wallet is $3\hat{i}+6\hat{j}$

Explanation:

Given that,

Radius of purse r= 2.30 m

Radius of wallet r'= 3.45 m

Acceleration of the purse $a=2\hat{i}+4.00\hat{j}$

We need to calculate the acceleration of the wallet

Using formula of acceleration

$a=r\omega^2$

Both the purse and wallet have same angular velocity

$\omega=\omega'$

$\sqrt{\dfrac{a}{r}}=\sqrt{\dfrac{a'}{r'}}$

$\dfrac{a}{r}=\dfrac{a'}{r'}$

$\dfrac{a'}{a}=\dfrac{r'}{r}$

$\dfrac{a'}{a}=\dfrac{3.45}{2.30}$

$\dfrac{a'}{a}=\dfrac{3}{2}$

$a'=\dfrac{3}{2}\times(2\hat{i}+4.00\hat{j})$

$a'=3\hat{i}+6\hat{j}$

Hence, The acceleration of the wallet is $3\hat{i}+6\hat{j}$

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3 years ago

A train travels 600 km in 4 hours. What is the speed of the train?

storchak [24]

Answer:

150 km/h

Explanation:

A speed measures a distance traveled over a period of time. We usually express speed in terms of km/h for example.

That train travels 600 km in 4 hours.

To find its average speed, we just need to divide 600 km / 4 hours

We then get 150 km/h

That's said to be the average speed since it's the total distance in the total of time.... it might have been slower or faster at different points during that distance/time.

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3 years ago

A man pulls on a (massless) rope tied to a tree with a force of 500 N. Later, two men pull on opposite ends of the same rope wit

qwelly [4]

Answer:

In both cases the tension in the rope is equal to 500N

Explanation:

It may be that in the case of the tree, the result is more intuitive, because you can think that there is only one force. But this is misleading.

To find the tension in the rope, you should draw a free body diagram. By doing so, you would find that the rope is static because there are two opposite forces. Assuming, for simplicity, that the rope is horizontal, a force of 500N is pulling to one direction (let's say to the right) and a force of 500N is pulling to the opposite direction (to the left). Else, the rope would not be static.

That analysys is the same for the rope tied to the tree ( the tree is pulling with 500N, such as the man, but in opposite direction) and when the rope is pulled by two men on opposite ends, each with forces of 500N.

Hence, the tension is the same and equal to 500N.

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3 years ago

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