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4 years ago

Which statement accurately describes what happens when water turns to ice in terms of energy

Physics

1 answer:

Deffense [45]4 years ago

7 0

Answer:

The water releases energy which causes the water molecules to have less kinetic and potential energy, changing their configuration from liquid to solid.

Explanation:

Confirmed through test.

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Determine el valor del ángulo de tiro de un proyectil que tarda en impactar en 8s y que tuvo un alcance de 0,3km.

Gelneren [198K]

Answer:

$46.3^{\circ}$

Explanation:

The motion of a projectile consists of two independent motions:

- A uniform motion along the horizontal direction (constant velocity)

- A uniformly accelerated motion along the vertical direction (constant acceleration)

The time of flight of a projectile is given by

$t=\frac{2u_y}{g}$

where

$u_y$ is the initial vertical velocity

$g=9.8 m/s^2$ is the acceleration due to gravity

Here the time of flight is

t = 8 s

So, the initial vertical velocity is:

$u_y=\frac{gt}{2}=\frac{(9.8)(8)}{2}=39.2 m/s$

At the same time, the horizontal distance covered by the projectile is given by

$d=u_x t$

where

$u_x$ is the horizontal velocity, which is constant

t is the time of flight

Here we know that the range of the projectile is 0.3 km, so

d = 0.3 km = 300 m

So the horizontal velocity is

$u_x=\frac{d}{t}=\frac{300}{8}=37.5 m/s$

Therefore, we can find the angle of projection of the projectile by using:

$\theta=tan^{-1}(\frac{u_y}{u_x})=tan^{-1}(\frac{39.2}{37.5})=46.3^{\circ}$

5 0

3 years ago

What is the correct answer?

bija089 [108]

Answer:

(B) 39

Explanation:

Use synthetic division:

-2 | 3 0 -1 3 1

____<u>-6 12 -22 38</u>

3 -6 11 -19 | 39

This means that the remainder is 39

4 0

3 years ago

Read 2 more answers

I need help on this.

4vir4ik [10]

It brings cold water from the bottom of the ocean.

4 0

3 years ago

Read 2 more answers

Two uniform solid spheres, A and B have the same mass. The radius of sphere B is twice that of sphere A. The axis of rotation pa

Svetach [21]

Answer:

Sphere B has 4 times more inertia than sphere A.

Explanation:

Inertia on a Solid sphere is given by:

$I = 2/5*M*R^2$

For this problem:

ma = mb = M

Rb = 2*Ra

With these values:

$Ia = 2/5*M*Ra^2$

$Ib = 2/5*M*(2*Ra)^2 = 4* (2/5*M*Ra^2)$

As you can see, Ib = 4 * Ia.

4 0

3 years ago

I need the answer to (c): Describe how the student accurately traces the path of the light emerging from the block through side

Artyom0805 [142]

Explanation:

i guess using a ruler.so first on the opposite side use your eye to alighn the ruler to the light from Ray box then draw a line or you can use pins and place them alighned to the Ray box an draw a line connecting the pins

3 0

3 years ago