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3 years ago

What happens to water when it changes to ice?

Physics

2 answers:

adelina 88 [10]3 years ago

7 0

Answer:

Density decreases, Volume increases

Explanation:

As the temperature decreases, the water contracts. Water has maximum density at 4° C. Thereafter, on further decrease in temperature, the water expands on cooling. Actually the water molecules crystallizes into open hexagonal structure. Thus, volume increases and density decreases. This is the reason that ice floats on water. The mass remains the same.

Vinvika [58]3 years ago

3 0

Answer:

Its density decreases, and its volume increases

Explanation:

Density is defined as Mass/Volume. What happens when water transforms into ice is that its density decreases because the volume the molecules now occupy increases.

The denominator of the rational expression $\frac{Mass}{Volume}$ is now larger (while the numerator stays the same), so the quotient gives a smaller number.

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How did the leaning tower of Pisa start leaning?

Ludmilka [50]

Answer:

The foundation was somewhat bad

Explanation:

The leaning was caused by the uneven settling of the building's foundations in the soft ground. Three of its eight stories had been completed when the uneven settling of the building’s foundations in the soft ground became noticeable. At that time, war broke out between the Italian city-states, and construction was halted for almost a century. This pause allowed the tower’s foundation to settle and likely prevented its early collapse.

hope this helps:)

8 0

3 years ago

Which of the following are vector quantities? Check all that apply.

Dennis_Churaev [7]

It’s distance for my answer but tell me if anyone tells u this answer thanks

8 0

3 years ago

A football is kicked straight up from a height of 5 feet with an initial speed of 55 feet per second. The formula h equals negat

makvit [3.9K]

Answer:

3.53 second

Explanation:

The formula for the height is

$h=-16t^{2}+55t+5$

When it hits the ground, the height is zero.

So, put h = 0 in the above equation

$0=-16t^{2}+55t+5$

$16t^{2}-55t-5=0$

$t=\frac{+55\pm \sqrt{55^{2}+4\times 5\times 16}}{2\times 16}$

$t=\frac{+55\pm 57.84}{2\times 16}$

Take positive sign

t = 3.53 second.

Thus, the time taken to hit the ground is 3.53 second.

8 0

3 years ago

Consider the resistances of short and open circuits. Fill in the blanks: The voltage across a short circuit will always be _____

aleksandr82 [10.1K]

Answer:

a) Zero

b) power source

Explanation:

According to Ohm's law, the voltage dropped in a resistance is proportional to the current flow and the resistor opposing to it.

$V=I*R$

For the case of a short circuit, the resistance tends to zero, so the voltage will tend to zero too.

In the case of the open circuit, the resitance will tend to infinity, because we cannot obtain an infite voltage, it will be limited by the power source.

3 0

3 years ago

The electric field everywhere on the surface of a thin, spherical shell of radius 0.800 m is of magnitude 902 N/C and points rad

Lilit [14]

Explanation:

(a) From E=

(8.99×10

N⋅m

)

(8.90×10

N/C)(0.750m)

=5.57×10

−8

But Q is negative since

→

points inward, so

Q=−5.57×10

−8

C=−55.7nC

(b) The negatve charge has a spherically symmetric charge distribution, concentric with the spherical shell

8 0

3 years ago