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3 years ago

When water in a lake freezes, the ice that forms floats on top of any water that is still liquid. Why does the ice float?

Physics

1 answer:

ddd [48]3 years ago

5 0

Answer:

it floats because the lake is cold at that moment so when part of the lake freezes it still remains solid and floats because of the lake and the surrounding of the lake is still cold

You might be interested in

What is inertia? (1 point)

snow_tiger [21]

The answer is C, an objects ability to not change its motion

Hope this helps!

4 0

2 years ago

At one point in space the Electric potential is measured to be 119 V at a distance of 1 meters away it is measured to be 43 V. F

Anni [7]

Answer:

76 V/m

Explanation:

$V_{i}$ = Electric potential at initial location = 119 V

$V_{f}$ = Electric potential at final location = 43 V

$d$ = distance between initial and final location = 1 m

$E$ = magnitude of electric field

Magnitude of electric field is given as

$E = \frac{- (V_{f} - V_{i})}{d}$

$E = \frac{- (43 - 119)}{1}$

$E$ = 76 V/m

8 0

3 years ago

When liquid silver nitrate and liquid sodium chloride are combined, solid silver chloride forms along with a new liquid, sodium

Karolina [17]

Answer:

Silver Chloride

Explanation:

A <em>precipitate</em> in chemistry is a substance that becomes solid during a chemical reaction.

Have a great day!

4 0

2 years ago

Burl the painter weighs 600 Newtons. He stands in the exact middle of his stage. There are two scale readings attached to the tw

chubhunter [2.5K]

Answer:

T = 300 N

Explanation:

As we know that the painter is standing at the middle of the scaffold

So here the two ropes will exert same tension on the scaffold

So we will have

$T_1 + T_2 = W$

also we know

$T_1 = T_2$

so we will have

$2T = W$

$T = \frac{W}{2}$

so tension is half of the weight in both the strings

So it is

T = 300 N

6 0

2 years ago

a 40 kilogramstudent runs up a staircase to a floor that is 5.0 meters higher than her starting point in 7.0 seconds. the studen

Wittaler [7]

When she reaches the top, she has more potential energy than she had at the bottom.

   Potential energy = (mass) x (gravity) x (height)

   = (40 kg) x (9.8 m/s²) x (5 m)

   = 1,960 more joules .

   Power = (energy) / (time)

   = (1,960 joules) / (7 seconds)

   = 280 watts

(about 0.375 horsepower)

3 0

2 years ago