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brilliants [131]
3 years ago
5

Using the formula ke = ½ mv² (where m= mass and v= velocity), what is the kinetic energy of a 8 kilogram ball traveling at 3 m/s

?
SAT
1 answer:
dem82 [27]3 years ago
6 0

Answer:

KE= 1/2(8x3 2)

=1/2(8x9)

1/2(72)

36j

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As a funeral procession enters an intersection all of the cars in the procession should:
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C. have their lights on. I hope this helps!
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4 years ago
The amount and the concentration of a salt solution.
ZanzabumX [31]

Answer:

28 g

3.4 g

Explanation:

These problems only make sense if the percentage is by weight. To find the amount of salt, multiply the amount of solution by the percentage that is salt:

a) (80 g)(35%) = 28 g . . . . weight of salt

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b) (20 g)(17%) = 3.4 g . . . . weight of salt

_____

Comment on percent

You know that % means /100, so 35% = 35/100 = 0.35.

4 0
3 years ago
The population of two different villages are modeled by the equations shown below. The population (in thousands) is represented
PilotLPTM [1.2K]

Answer:

1990 and 2010

y_l_w(15)=315\hspace{3}thousands\\y_l_c(15)=315\hspace{3}thousands\\y_l_w(35)=715\hspace{3}thousands\\y_l_c(35)=715\hspace{3}thousands

Explanation:

Let:

y_l_w=Population\hspace{3}of\hspace{3}Lewiston\\y_l_c=Population\hspace{3}of\hspace{3}Lockport

We need to know, in what year(s) the villages had the same population, mathematically this is:

y_l_w=y_l_c

So:

x^2-30x+540=20x+15\\\\Subtract\hspace{3}20x\hspace{3}from\hspace{3}both\hspace{3}sides\\\\x^2-50x+540=15\\\\Subtract\hspace{3}15\hspace{3}from\hspace{3}both\hspace{3}sides\\\\x^2-50x+525=0

Solving for x:

Factoring

(x-15)(x-35)=0

Hence:

x=15\\\\or\\\\x=35

Therefore the year(s) which the village had the same population are:

1975+15=1990\\\\and\\\\1975+35=2010

In order to find the population of both cities during the year(s) of equal population, just evalue the equations at x=15 and x=35:

y_l_w(15)=315\hspace{3}thousands\\y_l_c(15)=315\hspace{3}thousands\\y_l_w(35)=715\hspace{3}thousands\\y_l_c(35)=715\hspace{3}thousands

7 0
3 years ago
Please help me out! It's my science benchmark! Thank you!
ollegr [7]

Answer:

Hello!!

How are rocks and minerals related?

<u>c. Rocks are made of minerals </u>

Hope this helps!!

6 0
3 years ago
As of August 2015. all of the following nations have legalized same-sex marriage except.
Gnoma [55]

Answer:

indonisia

Explanation:

5 0
3 years ago
Read 2 more answers
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