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4 years ago

These four surfaces are opaque; that is they reflect or absorb certain rays of light determine the color

Physics

1 answer:

masya89 [10]4 years ago

4 0

In the first figure, the surface absorbs all colors except for green light, which is reflected: so, the surface will appear as green to our eyes, because green is the only color which is reflected by that surface.

Similarly, in the second figure, the surface absorbs all colors except for blue, and so the surface will appear blue to our eyes.

In the third figure, the surface absorbs all colors, so it will appear black to our eyes (because no colors are reflected, and black=absence of colors).

In the fourth figure, all colors are reflected: this means the surface will appear white to our eyes (white= sum of all colors).

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In order to remove water from a flooded basement, two pumps, each rated at 45 gallons per minute, are used. After half an hour,

LenKa [72]

Answer:

4050 gallons

Explanation:

In first half and hour both pumps are working property . There for it give, 45

gallons per minute . Half and hour is equal to 30 minutes.After one pump was broken only one pump is working 30 minutes .

For 1st 30 minutes ,( 2 pumps are working )

Gallons = 45 * 30 *2 = 2700 gallons

2nd 30 minutes ( 1 pump is working )

Gallons = 45*30*1 = 1350 gallons

Total gallons = 2700+1350

= 4050 gallons

8 0

3 years ago

If2.0J of work is done in raising a 180g apple how far is it lifted?

Alex

We know, W = F * s
W = mg * s

Here, w = 2 J
m = 180 g = 0.180 Kg
g = 9.8 m/s

Substitute their values into the expression:
2 = 0.180*9.8 * s
1.764s = 2
s = 2 / 1.764
s = 1.13 meter

In short, Your Final Answer is 1.13 m

Hope this helps!

7 0

3 years ago

Consider the following distribution of objects: a 2.00-kg object with its center of gravity at (0, 0) m, a 2.20-kg object at (0,

adelina 88 [10]

Answer:

body position 4 is (-1,133, -1.83)

Explanation:

The concept of center of gravity is of great importance since in this all external forces are considered applied, it is defined by

x_cm = 1 /M ∑ $x_{i}$ m_{i}

y_cm = 1 /M ∑ y_{i} mi

Where M is the total mass of the body, mi is the mass of each element

give us the mass and position of this masses

body 1

m1 = 2.00 ka

x1 = 0 me

y1 = 0 me

body 2

m2 = 2.20 kg

x2 = 0m

y2 = 5 m

body 3

m3 = 3.4 kg

x3 = 2.00 m

y3 = 0

body 4

m4 = 6 kg

x4=?

y4=?

mass center position

x_cm = 0

y_cm = 0

let's apply to the equations of the initial part

X axis

M = 2.00 + 2.20 + 3.40

M = 7.6 kg

0 = 1 / 7.6 (2 0 + 2.2 0 + 3.4 2 + 6 x4)

x4 = -6.8 / 6

x4 = -1,133 m

Axis y

0 = 1 / 7.6 (2 0 + 2.20 5 +3.4 0 + 6 y4)

y4 = -11/6

y4 = -1.83 m

body position 4 is (-1,133, -1.83)

7 0

4 years ago

Larry, a ten year old, first sees two identical glasses with water at the same level; then, the water from one of the short, wid

Crazy boy [7]

Larry, a 10-year-old, first sees two identical glasses with water at the same level;then, the water from one of the short, wide glasses is poured into a taller, thinner glass.Larry will likely conclude that <span>a. there is more water in the taller, thinner glass</span>

6 0

3 years ago

3. The Jupiter orbits the sun. What is the orbital speed and period?

Delicious77 [7]

The answer to your question is 77.3

5 0

3 years ago