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gayaneshka [121]
3 years ago
15

I need help with question two

Physics
1 answer:
zaharov [31]3 years ago
6 0
I can't see numbers here, so here are all the answers:
1) the frequency is c/λ = 3e8/556e-9 = 5.39e14Hz
2) light travels at <span>299,792,458 m/s.  So in nanoseconds it's 0.299792458m.  This is about 1/3 of a meter which is about one foot.
3) length is L = ct = (</span>299,792,458 m/s)(6e-15) = 1.799e-6m or 1.799μm

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Helpppppppp<br> ill give brainliest
Nina [5.8K]

Answer:

I believe the answer is

B. \: 3 \: red, \: 8 \: yellow, \: 1 \: blue

Explanation:

I may be incorrect because I used to do this a long time ago but I believe I am correct

HOPE THIS HELPS!

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4 0
3 years ago
Difference between effort and load​
scoray [572]

<u>Answer</u>:

Effort is the unaltered force. Load is the altered force.

4 0
3 years ago
What is the momentum of an object that has a mass of 0.03 grams and a velocity of 1200 m/s2
ruslelena [56]

answer is 36

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mass×velocity

3 0
3 years ago
Need some help please
11Alexandr11 [23.1K]

Answer:

x^2\neq -\frac{5}{13}

First option

Explanation:

<u>Operations with functions </u>

Given two functions f, g, we can perform a number of operations with them including addition, subtraction, product, division, composition, and many others .

We have

f(x)=20x^3-7x^2+3x-7

g(x)=-13x^2-5

We are required to find

\displaystyle \frac{f}{g}(x)

We simply divide f by g as follows

\displaystyle \frac{f}{g}(x)=\frac{20x^3-7x^2+3x-7}{-13x^2-5}

We know rational functions may have problems if the denominator can be zero for some values of x. We must find out if there are such values and exclude them from the domain of the new-found function. We must ensure

-13x^2-5\neq 0

or equivalently

x^2\neq -\frac{5}{13}

Thus the first option is correct

Note: Since x^2 is always a positive number (for x real), our function does not really have any restriction in its domain

8 0
3 years ago
Some kids are playing by rolling a skateboard across level ground beside a 0.75 m high wall. The goal is to drop from the wall v
lys-0071 [83]

Answer:

The speed of the kid and the skateboard together is 0.723 m/s

Explanation:

Let the mass of the kid be m_{k} = 45 kg

Let the mass of the skateboard be m_{s} = 4,5 kg

The initial speed of the skateboard, v_{s} = 8 m/s

The initial horizontal speed of the boy as he jumps on the skateboard, v_{k} = 0 m/s

Let the speed of the kid and the skateboard together be v

According to the principle of conservation of momentum:

m_{k} v_{k} + m_{s} v_{s} = (m_{k} + m_{s}) v

Substituting the appropriate values into  the given equation

(45*0) + (4.5*8) = (45 + 4.8) v

36 = 49.8 v

v = 36/49.8

v = 0.723 m/s

7 0
4 years ago
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