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3 years ago

You are pushing a 20 N object for 3 meters. If you have to push

Physics

1 answer:

Ludmilka [50]3 years ago

5 0

Answer:

For the first equation, the work done would be 60 J, but if it is done with 30 N, it would have been 90 J.

Explanation:

it's actually pretty easy one you practice it for some time. W ( work done in joules ) = F ( force put onto the object in newtons ) * D ( distance traveled in meters ).

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True or false? When an object deforms, the change of shape is always permanent.<br> false<br> true

Alik [6]

True. Because say if you go to a junk place where you can break anything and you decide to squish a printer with a car and when you go look at the printer it’s all deformed there’s really no way that you can fix it. Lol that was an example

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3 years ago

How are astronomers able to observe and study black holes?

Ber [7]

Although scientists can't detect or observe black holes with telescopes that detect x-rays, light, or other many other different forms of electromagnetic radiation and waves. But they can detect and study them by the effect of matter near it. If a black hole passes through a cloud of interstellar matter, it will draw matter inward (this process is known as accretion). A similar process occurs when a star passes through a black hole. When this happens, a star can break apart as it pulls it self toward it. As the attracted matter accelerates and starts heating up, it emits x-rays that are radiate into space.
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Hope this Helps! (:

5 0

3 years ago

Question #1: The visible part of the EM spectrum ranges from about 390 nanometers to about 720 nanometers. A nanometer (nm) is 1

mojhsa [17]

Answer:

The blue light has the highest energy.

Explanation:

Body that is hot enough emits light as consequence of its temperature. For example, an iron bar in contact with fire will start to change colors as the temperature increases until it gets to a blue color. That its know as Wien's displacement law, which establishes that the peak of emission for the spectrum will be displaced to shorter wavelengths as the temperature increases.

The same scenario described above can be found in the star, a star with higher temperature will have a blue color and one with lower temperature will have a red color.

$T = \frac{2.898x10^{-3} m. K}{\lambda max}$ (1)

The energy of each wavelength can be determined by means of the following equation:

$E = h\nu$ (2)

but $\nu = \frac{c}{\lambda}$ , therefore:

$E = \frac{hc}{\lambda}$ (3)

Where h is the planck's constant and $\nu$ is the frequency.

Notice that it is necessary to express the frequency in units of meters for a better representation of the energy.

$\nu_{blue} = 400nm . \frac{1x10^{-9}m}{1nm}$ ⇒ $4x10^{-7}m$

$\nu_{red} = 720nm . \frac{1x10^{-9}m}{1nm}$ ⇒ $7.2x10^{-7}m$

Case for the bluest light:

$E = \frac{(6.626x10^{-34}J.s)(3x10^{8}m/s)}{4x10^{-7}m}$

$E = 4.96x10^{-19}J$

Case for the reddest light:

$E = \frac{(6.626x10^{-34}J.s)(3x10^{8}m/s)}{7.2x10^{-7}m}$

$E = 2.76x10^{-19}J$

Equation 3 show that if the wavelength is lower the energy will be greater (inversely proportional).

Hence, according with the result and what was explained above, the blue light has the highest energy.

7 0

3 years ago

A car’s bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable object without damage to the body of th

poizon [28]

Answer:

The force bumper at 0.200m

F=2722.5 N

Explanation:

Using the energy theorem of work

$W=K_{f}- K_{i}$

W=ΔK

W=F*d

ΔK= $\frac{1}{2}*m*v_{f} ^{2} -\frac{1}{2}*m*v_{i} ^{2}$

$v_{i} =0$

ΔK=F*d= $\frac{1}{2}*m*v_{f} ^{2} -\frac{1}{2}*m*v_{i} ^{2}$

$F*d=\frac{1}{2}*m*0 ^{2}- \frac{1}{2}*m*v_{i} ^{2}\\F*d=-\frac{1}{2}*m*v_{i} ^{2}=\frac{1}{2}*900kg*(1.1\frac{m}{s})^{2}\\F*d=544.5\frac{kg*m}{s^{2}}\\ F=\frac{544.5\frac{kg*m}{s^{2}}}{0.2m} \\F=2722.5 N$

3 0

3 years ago

Can someone please help me, thanks.

Ratling [72]

YES it won’t let me submit my answer

6 0

3 years ago

Read 2 more answers