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3 years ago

A block of copper weighs 2160g and has a volume of 240cm3. what is the density of the copper?

1 answer:

3 0

The unit of density [kgm^-3] displays the formula.
So density=mass/volume.

Convert 2160g into kilograms [2160/1000=2.160kg]
Convert volume of 240cm^3 into m^3
100cm=1m
100x100x100=1000000cm^3=1m^3
240/1000000=[2.4x10^-4]

Final calculation
2.160/2.4x10^-4=9000

Answer: 9000kgm^-3

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Elanso [62]

So, first of all, let's convert the fraction $\frac{3}{8}$ into a decimal, which would be 0.375 (3 divided by 8)

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Now. we simply multiply our decimal by three in order to get our answer!

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3 years ago

Hello! Anyone able to help me with question 3 + explanation too? Thanks!

taurus [48]

Answer:

2 or 12

Step-by-step explanation:

The answer that we will use this equation 1/t1 +1/t2=1/ttotal

where t1 is the time of smaller pipe while t2 is the of the larger pipe

Given t total =4 while t2 is equal to t2=t1-6

So know you can solve the problem by changing it into (2t1-6)/(t1*(t1-6))=1/4

8( t1-3)=(t1^2-6t1)

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5 0

4 years ago

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The value of a house has increased by $4,200 in the past year. By what percent has the value increased if the value last year wa

IgorC [24]

Answer:

The value has increased by 8 percent.

Step-by-step explanation:

Given:

The value of a house has increased by $4,200 in the past year.

The value last year was $52,500.

Now, to find the percent increased.

Value of house = $52,500.

Value of house last year increased by = $4200.

So, to get the percent increased:

$\frac{Value\ of\ house\ last\ year\ increased\ by} {Value\ of\ house}\times 100.$

$=\frac{4200}{52500} \times 100$

$=0.08\times 100$

$=8\ percent.$

Therefore, the value has increased by 8 percent.

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3 years ago

In which quadrant or axis do the following points lie ? (a) (-5, 5) (b) (3, 9) (c) (2, -6) (d) (-5, -3)

marissa [1.9K]

Answer:

unkwon answer ewan madaling sabihin ya

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3 years ago

Again, plz help I’m desperate

OlgaM077 [116]

Perpendicular = opposite sign and reciprocal slope
Make equation y= mx + b
3x + 4y = 24
4y = -3x + 24
y = -3/4x + 6
Now make slope perpendicular
Slope = 4/3
The answer would be B.

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3 years ago

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