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RoseWind [281]
3 years ago
6

50 points!! Help needed

Mathematics
2 answers:
babunello [35]3 years ago
4 0

Answer:

1) Enlargement

2) Reduction

Step-by-step explanation:

Question 1

200% means double, a factor 2

a) 2(2.5) = 5 inches

it's an enlargement

b) 2(original) = new/on the page

Question 2

a) 0.6(24) = 14.4 inches

Reduction

b) 0.6(original) = new/sketch

Marizza181 [45]3 years ago
3 0

Answer:

1. 50in; enlargement; 2.5in x 0.2(200%)=0.5x100=50.

Step-by-step explanation:

2. 24x0.6=14.4

Reduction would be 14.4in

24÷0.6=40

Enlargement would be 40in.

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Neporo4naja [7]

Answer:

c = 100\,\frac{J}{kg\cdot ^{\circ}C}

Step-by-step explanation:

According to the First Law of Thermodynamics, the heat received by the metal cylinder is equal to the change in the internal energy. That is:

Q = \Delta U

Q = m \cdot c \cdot \Delta T

The specific heat is clear in the previous expression and finally computed:

c = \frac{Q}{m\cdot \Delta T}

c = \frac{1600\,J}{(2\,kg)\cdot (13^{\circ}C-5^{\circ}C)}

c = 100\,\frac{J}{kg\cdot ^{\circ}C}

6 0
3 years ago
What is the area of the shaded section?
Ray Of Light [21]

Answer:

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8 0
3 years ago
Need help <br><br><br><br><br><br> help me plz
Natasha2012 [34]

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6 0
2 years ago
The force of the wind blowing on a vertical surface varies jointly as the area of the surface and the square of the velocity. If
Ierofanga [76]

Answer:

a force of 1250lb is exerted

Step-by-step explanation:

since the force of the wind varies jointly as the area of the surface and the square of the velocity,

let f = force

a = area

velocity =v

from the above statement, we find out that

f \alpha a*v^2----1

that is f= k* a* v^2     -----2

where k is a coefficent of proportionality

since velocity of wind in mph,v =50

and force in lb = 20

and surface area =1/5 th ft^2

from eqn 2

we have that

20 =k*\frac{1}{5}* 50^2

making k subject of the formula

we have that

k =\frac{20}{\frac{1}{5} *50^2 } =\frac{1}{25} (lb.mph^-1.ft^-2)

that means that f =\frac{1}{25} *a *v^2  ---3

however, when velocity = 125mph

surface area =2ft^2

putting values in eqn 3 we have

f= \frac{1}{25}*2*125^2 = 1250 lb

hence a force of 1250lb is exerted

7 0
3 years ago
y=-3/4x+9<br> y=-1/2x+8<br> X= <br> y= <br> According to them to problems what’s the X and Y?
muminat
<h3><em><u>Your </u></em><em><u>answer </u></em><em><u>is </u></em><em><u>here </u></em><em><u>mate</u></em><em><u>!</u></em><em><u>!</u></em><em><u>! </u></em></h3>

Y = -3/4x + 9 ...eq( 1 )

Y = -1/2x + 8 ...eq( 2 )

<em><u>Subsituting </u></em><em><u>eq(</u></em><em><u> </u></em><em><u>1</u></em><em><u> </u></em><em><u>)</u></em><em><u> </u></em><em><u>in </u></em><em><u>eq(</u></em><em><u> </u></em><em><u>2</u></em><em><u>)</u></em><em><u> </u></em><em><u>we </u></em><em><u>get</u></em><em><u>, </u></em>

-3/4x + 9 = -1/2x + 8

-3/4x + 1/2x = 8 - 9

-3x + 2x/4 = - 1

- x = -1 * 4

x = 4

<em>Thus</em><em>, </em><em>The </em><em>value </em><em>of </em><em>x </em><em>is </em><em>4</em><em> </em>

<u>Therefore</u><u>, </u>

<em>Subsituting </em><em>the </em><em>value </em><em>of </em><em>x </em><em>in </em><em>eq(</em><em>2</em><em> </em><em>)</em>

Y = -1/2 * 4 + 8

Y = -2 + 8

Y = 6

<em>Thus</em><em>, </em><em> </em><em>The </em><em>value </em><em>of </em><em>y </em><em>is </em><em>6</em>

<em>Hence</em><em>, </em><em> </em><em>The </em><em>value </em><em>of </em><em>x </em><em>and </em><em>y </em><em>is </em><em>4</em><em> </em><em>and </em><em>6</em><em> </em><em>.</em>

3 0
2 years ago
Read 2 more answers
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