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3 years ago

Why do you see something as white, black, or another specific color

Physics

2 answers:

larisa86 [58]3 years ago

8 0

We see something as white, black, or another specific color because the object is reflecting light waves back.

In a nutshell; If we view an object as red, then the object is:

-> reflecting back red light waves

-> absorbing blue, green, etc light waves.

What about white and black?

We see white when most all of the light is reflected.

When there is little to no light reflected, we see black.

n200080 [17]3 years ago

8 0

Answer:

When nearly all light is reflected, you see white. When no light is reflected, you see black.

Explanation:

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A racquet ball with mass m = 0.256 kg is moving toward the wall at v = 11.8 m/s and at an angle of θ = 29° with respect to the h

icang [17]

Answer:

Part a)

$P = 5.72 kg m/s$

Part b)

$\Delta P = 2.93 kg m/s$

Part c)

$F = 44.4 N$

Part d)

$\Delta P = 5.02 kg m/s$

Part e)

$\Delta t = 0.113 s$

Part f)

$\Delta K = 0$

Explanation:

As we know that initial velocity of the ball is given as

$v = 11.8 cos29 \hat i + 11.8 sin29 \hat j$

$v_i = 10.3 \hat i + 5.72 \hat j$

Now final velocity of the system is given as

$v_f = 10.3\hat i - 5.72\hat j$

Part a)

now magnitude of initial momentum is given as

$P = mv$

$P = 0.256(11.8)$

$P = 5.72 kg m/s$

Part b)

Change in momentum is given as

$\Delta P = m(v_f - v_i)$

$\Delta P = 0.256(5.72 + 5.72)$

$\Delta P = 2.93 kg m/s$

Part c)

As we know that average force is defined as the rate of change in momentum

so here we have

$F = \frac{\Delta P}{\Delta t}$

$F = \frac{2.93}{0.066}$

$F = 44.4 N$

Part d)

Magnitude of change in momentum is given as

$\Delta P = m(v_f - v_i)$

$\Delta P = 0.256(7.8 + 11.8)$

$\Delta P = 5.02 kg m/s$

Part e)

As we know that in 2nd case the force is same as the initial force

so we will have

$\frac{\Delta P}{\Delta t} = F$

$\frac{5.02}{\Delta t} = 44.4$

$\Delta t = 0.113 s$

Part f)

Since this is elastic collision so change in kinetic energy must be ZERO

$\Delta K = 0$

8 0

3 years ago

Heat is also called

Mrac [35]

Thermal energy (any word that begins with therm has to do with heat)

6 0

3 years ago

Read 2 more answers

What forms of light can be observed with telescopes at sea level?

ivolga24 [154]

Answer:

Visible light

Radio waves

Explanation:

Although these different types of electromagnetic radiation share many basic properties (for example, they all travel at the same speed - the speed of light -), each interacts differently with matter. For example, our body is transparent to X-rays, but it is not transparent to visible light; Our eyes respond to visible light, but not to gamma rays, and our radios detect radio waves, but not ultraviolet light. Visible light, some regions of infrared radiation and millimeter and radio waves can be seen from the earth's surface. Therefore, astronomers require different types of telescopes to detect radiation at these varied wavelengths. For example, a radio telescope that detects radio waves from space is very different from an X-ray telescope, or an ordinary optical telescope. On the other hand, some regions of the infrared, ultraviolet light, X-rays and gamma rays require telescopes outside the Earth's atmosphere, since it prevents their passage.

8 0

4 years ago

8. You and your little brother are arguing over a sweater. If you pull

Vedmedyk [2.9K]

Answer:

The sweater will move towards you with a force of 35 N

Explanation:

In this problem, we have two forces acting on the sweater:

- A force of 65 N towards you

- A force of 30 N acting towards your brother

We can choose the direction "towards you" as positive, so that we can write the two forces as follows

$F_1 = +65 N\\F_2 = -30 N$

Therefore, the net force acting on the sweater will be

$F=F_1 + F_2 = +65 +(-30) = +35 N$

And the positive sign (+) indicates that the direction of the net force is towards you, so the sweater will move towards your direction.

6 0

4 years ago

If the specific latent heat of ice is 340 000 J/kg,

Ganezh [65]

Answer:

jsjdgsudgwid s

Explanation:

83638hr is 3738 so 8273 and 837y37 and 82638 say hi to 1937

6 0

3 years ago