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yKpoI14uk [10]
3 years ago
5

How long does it take to freeze ice cubes?

Physics
1 answer:
eduard3 years ago
4 0

<span>It actually depends on what water and what is in the water that you are freezing. Normal temperature water will freeze in about 3 to 4 hours, if you want it to really be hard, but it can already start freezing in about an hour. However, boiling water said to freeze faster.</span>

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What happens when Earth rotates on its axis and how long does it take
faust18 [17]

Answer:

You get Day and Night

It takes 24 hour

8 0
3 years ago
Read 2 more answers
A car with mass 950 kg and a speed of 16 m/s approaches an intersection. A 1300 kg minivan traveling at 21 m/s is heading for th
Alex73 [517]

Answer:

V_f = 13.8863 \angle 60.89\°

Explanation:

Our values are,

m_1 = 950Kg\\v_1 = 16m/s \\m_2 =1300Kg\\v_2 = 21m/s

We have all the values to apply the law of linear momentum, however, it is necessary to define the two lines in which the study will be carried out. Being an intersection the vehicle of mass m_1 approaches through the X axis, while the vehicle of mass m_2 approaches by the y axis. In the collision equation on the X axis, we despise the velocity of object 2, since it does not come in this direction.

m_1v_1=(m_1+m_2)v_fcos\theta

For the particular case on the Y axis, we do the same with the speed of object 1.

m_2v_2=(m_1+m_2)v_fsin\theta

By taking a final velocity as a component, we can obtain the angle between the two by relating the equations through the tangent

Tan\theta = \frac{m_2v_2}{m_1v_1}\\Tan\theta = \frac{1300*21}{950*16}\\\theta = tan^{-1}(1.7960)\\\theta = 60.89\°

Replacing in any of the two functions, given above, we will find the final speed after the collision,

(950)(16)=(950+1300)V_fcos(60.89)

V_f= \frac{(950)(16)}{(950+1300)cos(60.89)}

V_f = 13.8863 \angle 60.89\°

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3 years ago
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CP Bang! A student sits atop a platform a distance h above the ground. He throws a large firecracker horizontally with a speed.
Firlakuza [10]

Answer:

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Explanation:

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The vertical start speed is zero

            t² = 2t / g

The horizontal document has an acceleration, with direction opposite to the speed therefore it is negative, the expression is

            x = v₀ₓ t - ½ a t²

Indicates that it reaches the same exit point x = 0

           v₀ₓ t = ½ a t2

           v₀ₓ = ½ a (2h / g)

           v₀ₓ = v₀

           h = v₀ g / a

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Wegener named the supercontinent Pangaea, which means
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