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Mnenie [13.5K]
3 years ago
5

Study the motion map shown. what do the circled vectors represent?

Physics
1 answer:
BabaBlast [244]3 years ago
3 0

Answer:

It's option d - Negative acceleration

Explanation:

  • Let's start by demonstrate why <em>it's not option b - Speed : </em>Speed is a scalar quantity so it can not be represented by a vector
  • Let's check that <em>the green  vectors represent velocity</em> (velocity is a vector quantity, velocity is a direction aware, while speed is just a scalar)

  • Now let's  show that the circled vectors are acceleration vectors:

Mathematically position X , velocity V and acceleration A are:

\frac{dX}{dt} = V and \frac{dV}{dt} = A

Where X, V, A are vectors and \frac{d(a)}{dt} = b  indicates the derivate a of a time is equal to b.

So, this show that acceleration is a rate respect of time of velocity ⇒ When acceleration is positive, velocity increments, when acceleration is negative, velocity decrements.

<em>The above explanation correspond to the motion map shown, getting demonstrated that the answer is D - Negative acceleration </em>

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Answer:

A. More than 20% of your daily recommended amount.

Explanation:

Reading food labels can be tricky. The percent daily value listed on the right of all food labels lets you know what percent out of the recommended daily intake of each nutrient you are consuming in that specific food.

To check if the food you're consuming is a good source of that nutrient you need in higher amount, the nutrient must be labeled 20% or higher.

The rule used here is called the 5/20 rule. According to this rule, A nutrient that is 5% or below is considered less and a nutrient which is labeled 20% or higher is considered good enough in that food source.

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3 years ago
In a pig caller can produce a sound intensity level of 107 dB. How many pig callers would be needed to generate an intensity lev
myrzilka [38]

Answer:

20 pig callers

Explanation:

Given that:

A pig caller produced intensity level of  a sound = 107 dB

To find how many pig callers required to generate an intensity level of 120 dB;

we have:

120 dB - 107 dB = 13 dB

Taking the logarithm function;

10 \ log \bigg(\dfrac{I}{I_o} \bigg) = 13 \ dB

where;

I_o = initial intensity

log \bigg(\dfrac{I}{I_o} \bigg) = 1.3

\dfrac{I}{I_o}=  10^{1.3 }

I = 19.95I_o

I ≅ 20 pig callers

6 0
3 years ago
Akia is balancing the equation Na + H2O NaOH + H2. He tries to find the coefficients that will balance the equation. How could h
bixtya [17]

Answer:

by counting each individual atom and making sure the number of each kind of atom is the same in the reactants and the products. - This is the answer.

Explanation:

3 0
3 years ago
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3 years ago
1. A 1,000-kg car has 50,000 joules of kinetic energy. What is its speed?
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Use KE= 1/2mv^2
So... 
50,000=(.5)(1,000)v^2
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Divide 500 on both sides 
100 = v^2 
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4 0
3 years ago
Read 2 more answers
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