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3 years ago

5

You are using a rope to lift a 14.5 kg crate of fruit. Initially you are lifting the crate at 0.500 m/s. You then increase the t

ension in the rope to 150 N and lift the crate an additional 1.15 m. During this d motion, how much work is done on the crate by the tension force?

1 answer:

lina2011 [118]3 years ago

5 0

Answer:

W = 172.5 J

Explanation:

given,

mass of the fruit crate = 14.5 kg

initial velocity to lift = 0.500 m/s

increase in the tension = 150 N

lift of crate = 1.15 m

work done by the tension = ?

work done = force x displacement

W = F s cos θ

θ = 0°

W = F s x cos 0

W = 150 x 1.15 x 1

W = 172.5 J

Work done on the crate by the tension force = W = 172.5 J

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Answer:

The wave speed is calculated below:

Explanation:

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The wavelength of red helium-neon laser light in air is 632.8 nm.(a) What is its frequency? Hz(b) What is its wavelength in glas

vekshin1

<h2>Answers:</h2>

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$v=f.\lambda$ (1)

Where $f$ is the frequency and $\lambda$ the wavelength.

In the case of light, its speed is:

$c=f.\lambda$ (2)

On the other hand, the described situation is known as Refraction, a phenomenon in which the light changes its direction when passing through a medium with a refractive index different from the other medium.

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In addition, as the light changes its direction, its wavelength changes as well:

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Knowing this, let's begin with the answers:

<h2>a) Frequency</h2>

From equation (2) we can find $f$ :

$f=\frac{c}{\lambda}$ (5)

Knowing that $1nm=(10)^{-9}m$ :

$f=\frac{3(10)^{8}m/s}{632.8(10)^{-9}m}$

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<h2>b) Wavelength in glass</h2>

We already know the wavelength of the light in air $\lambda_{air}$ and the index of refraction of the glass.

So, we only have to find the wavelength in glass $\lambda_{glass}$ from equation (4):

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<h2>c) Speed in glass</h2>

From equation (3) we can find the speed $v$ of this light in glass:

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