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3 years ago

The graph above represents an object moving with a __________________.

Physics

2 answers:

densk [106]3 years ago

3 0

... cloak of invisibility spread over it.

Firlakuza [10]3 years ago

3 0

D) constant negative acceleration

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How does the wavelength of maximum absorbance relate to color?

eimsori [14]

Answer:when a white light falls on an object, the wavelength of maximum absorbance is removed by absorption and the remaining wavelength are reflected to the eye.

Explanation:Furthermore,this relationship entails that the color not absorbed is the color of the object,for example plants are green because they reflect green light and absorb red and blue light.

5 0

3 years ago

An 8.7 g bullet is accelerated in a rifle barrel 105 cm long to a speed of 465 m/s. Use the work-energy theorem to find the aver

Viktor [21]

Answer:896 N

Explanation:

Given

mass of bullet $m=8.7 gm$

Length of barrel $d=105 cm=1.05 m$

final velocity $v=465 m/s$

initial velocity $u=0 m/s$

Work done by all the forces is equal to change in kinetic Energy

$F\cdot d=\frac{1}{2}\times mv^2-0$

$F_{avg}\times 1.05=\frac{1}{2}\times 8.7\times 10^{-3}\times 465^2$

$F_{avg}=\frac{0.5\times 8.7\times 10^{-3}\times 465^2}{1.05}$

$F_{avg}=895.789 Na\pprox 896 N$

6 0

3 years ago

If the frequency of this beam is increased while the intensity is held constant, does the number of electrons ejected per second

Ivan

Answer:

if the intensity of photons is constant then number of ejected electrons will remain same

Explanation:

As per photoelectric effect we know that when light of sufficient frequency fall on the surface of metal then electrons get ejected out of the surface with certain kinetic energy

Here the energy of photons is used to eject out the electrons from metal surface and to give the kinetic energy to the ejected electrons

so we have

$h\nu = W + KE$

here W = work function of metal which shows the energy required to eject out electrons from metal surface

KE = kinetic energy of ejected electrons

now if we increase the frequency of the photons that incident on the metal surface then in that case the incident energy will increase

So the electrons will eject out with more kinetic energy while if the number of photon is constant or the intensity of photons is constant then number of ejected electrons will remain same

8 0

3 years ago

If the heat of fusion is 32.2 kj/mol, the amount of heat energy required to melt 5.67 grams of feo is

anzhelika [568]

The heat of fusion is the amount of energy required to change the state of one mole of substance from solid to liquid at constant temperature. Therefore, in order to determine the energy needed by a given mass of substance, we must first convert the mass into moles by using:
Moles = mass / Mr
Moles = 5.67 / 71.84
Moles = 0.079 mol

Energy = latent heat of fusion * moles
Energy = 32.2 * 0.079
Energy = 2.544 kJ = 2,544 J

3 0

3 years ago

1) mechanical

iris [78.8K]

I am pretty sure about these answers.Thermal goes in the 4th blank.
Mechanical goes in the 2nd blank.
Electrical goes in the 3rd blank.
I think chemical goes in the 1st blank and light goes in the 5th blank
Hope this helps

5 0

3 years ago