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3 years ago

Which of the following statements is true?

Physics

2 answers:

Maurinko [17]3 years ago

6 0

Answer:

Concrete absorbs visible light and re-radiates it as infrared energy.

Explanation:

As we know that concrete will not reflect 100% light incident on it but it will absorb few energy and remaining energy is reflected back.

So here when visible light incident on the concrete then few of its energy is absorbed by is and then the remaining energy is reflected back.

Since the reflected energy must be less than the energy which incident on the concrete so here we will say that the reflected waves must be of less frequency range

so here most appropriate energy range of reflected wave is infrared waves

so here correct answer will be

Concrete absorbs visible light and re-radiates it as infrared energy.

lisabon 2012 [21]3 years ago

3 0

Answer:

Concrete absorbs visible light and re-radiates it as infrared energy.

Explanation:

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A spherical object (with non-uniform density) of mass 16 kg and radius 0.22 m rolls along a horizontal surface at a constant lin

Lapatulllka [165]

Answer:

Kr = 0.7618K

Explanation:

Suppose that the object's velocity is V, then his kinetic energy is:

K = $\frac{mv^{2} }{2}$

K = $\frac{(16)v^{2} }{2}$

K = 8 $v^{2}$

The rotational kinetic energy is

Kr = $\frac{Iw^{2} }{2}$

where I: The moment of inertia

ω: angular velocity

Kr = $\frac{(0.59)w^{2} }{2}$

Kr = 0.295 $w^{2}$

How the movement is without slipping, then

ω = $\frac{v}{r}$

ω = $\frac{v}{0.22}$

Thus

Kr = $\frac{0.295v^{2} }{0.22^{2} }$

Kr = 6.095 $v^{2}$

8 $v^{2}$ ----> 1

6.095 $v^{2}$ ----->?

Kr = 0.7618K

4 0

4 years ago

Which of the following best describes the gas trapped in a sealed balloon?

aliina [53]

"C) The movement of the gas particles keeps the balloon inflated" best describes the gas trapped in a sealed balloon, although the movement varies with the heat of the gas.

4 0

3 years ago

If the motion of B is uniformly accelerated, at what time will both graphs have

Misha Larkins [42]

Answer:

Im just here for the points man sorry

Explanation:

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3 years ago

Which of the following is not true about the Law of Conservation of Energy?

SVEN [57.7K]

By definition, the law of conservation of energy states that:

Ei = Ef

Where,

Ei: initial energy

Ef: final energy

Therefore, no matter the type of energy, always the final energy is equal to the final energy.

Energy can be transformed into another type of energy. For example, the potential energy can be transformed into kinetic energy.

Also, energy is not created, nor destroyed.

Answer:

The following is not true about the Law of Conservation of Energy:

A. It states that the total energy in the universe keeps increasing.

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3 years ago

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What types of galaxies are these?

Orlov [11]

Answer:

the first one looks like a spiral galixy

the 2nd one looks like a lenticular galixy ?? (im pretty sure but not 100%)

the 3rd one looks like a elliptical galixy

Explanation:

3 0

2 years ago

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