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3 years ago

Why does refraction occur?

Physics

1 answer:

irina1246 [14]3 years ago

4 0

Answer:

The answer is C.

Explanation:

Let's take a glass of water as an example. Now, shine a flashlight on it. See it bend the light into a rainbow? That is a example of refraction. When the light enters the water, the water actually slows down and changes its direction, causing the light to come out the other side in a different way. Since water is very dense, it can bend the water and make it different.

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A lunch pail is accidentally kicked off a steel beam on a building under construction. Suppose the initial horizontal speed is 1

vichka [17]

1) 26.6 m

Along the horizontal direction, the lunch pail is moving with a uniform motion (constant speed), since there are no forces acting in this direction.

Therefore, the distance travelled horizontally after a time t is given by:

$d=v_x t$

where we know

$v_x = 1.50 m/s$ is the horizontal velocity

d = 3.50 m is the distance covered horizontally

Solving for t, we find the total time of the motion:

$t=\frac{d}{v_x}=\frac{3.50}{1.50}=2.33 s$

Now we know that the pail takes 2.33 s to fall to the ground. We can now consider the vertical motion of the pail, which is a free fall motion, so the vertical displacement is given by the equation

$s=ut+\frac{1}{2}at^2$

where, taking downward as positive direction:

u = 0 is the initial vertical velocity

$a=g=9.8 m/s^2$ is the acceleration of gravity

Substutting t = 2.33 s, we find how fat the pail has fallen:

$s=\frac{1}{2}(9.8)(2.33)^2=26.6 m$

2) 10.7 m

In this case, we know instead the vertical displacement:

$s=2.50\cdot 10^2 m = 250 m$

Therefore, we can use the same equation again

$s=ut+\frac{1}{2}at^2$

To find the total time of motion:

$t=\sqrt{\frac{2s}{a}}=\sqrt{\frac{2(250)}{9.8}}=7.14 s$

We know that along the horizontal direction, the velocity is constant:

$v_x = 1.50 m/s$

So, the horizontal distance covered in this time is

$d=v_x t = (1.50)(7.14)=10.7 m$

6 0

4 years ago

An electron is moving through an (almost) empty universe at a speed of 628 km,/s toward the only other object in the universe —

sattari [20]

Answer:

r = 2,026 10⁹ m and T = 2.027 10⁴ s

Explanation:

For this exercise let's use Newton's second law

F = m a

where the force is electric

F = $k \frac{q_1q_2}{r^2}$

Acceleration is centripetal

a = v² / r

we substitute

$k \frac{q_1q_2}{r^2} = m \frac{v^2}{r}$

r = $k \frac{q_1q_2}{m \ v^2}$ (1)

let's look for the charge in the insulating sphere

ρ = q₂ / V

q₂ = ρ V

the volume of the sphere is

v = 4/3 π r³

we substitute

q₂ = ρ $\frac{4}{3}$ π r³

q₂ = 3 10⁻⁹ $\frac{4}{3}$ π 4³

q₂ = 8.04 10⁻⁷ C

let's calculate the radius with equation 1

r = 9 10⁹ 1.6 10⁻¹⁹ 8.04 10⁻⁷ /(9.1 10⁻³¹ 628 10³)

r = 2,026 10⁹ m

this is the radius of the electron orbit around the charged sphere.

Since the orbit is circulating, the speed (speed modulus) is constant, we can use the uniform motion ratio

v = x / t

the distance traveled in a circle is

x = 2π r

In this case, time is the period

v = 2π r /T

T = 2π r /v

let's calculate

T = 2π 2,026 10⁹/628 103

T = 2.027 10⁴ s

4 0

3 years ago

What happens when multiple forces act upon an object?

Bogdan [553]

The object will move if the forces are unbalanced.

Newtons second tells you that when a net force (the unbalanced force) is applied to and object it will produce an acceleration (movement) in direct proportion to the force and in inverse proportion to the mass of the object.

7 0

3 years ago

Read 2 more answers

You are operating a pwc in an area where swimmers are in the water. When must you slow your pwc to "slow, no wake speed"?.

Lostsunrise [7]

You should slow your pwc to "slow, no wake speed" when within 100 feet of anchored vessels or non-motorized craft.

This is the process of operating a personal watercraft at the slowest possible speed.

This helps to maintain steerage which prevents different forms of accident or risks when in motion in the water.

Read more about Slow-no-wake here brainly.com/question/10410716

#SPJ1

4 0

2 years ago

A car moving with a velocity of 20 meters/second has

kenny6666 [7]

Kinetic energy is the energy of an object in motion. It is expressed as the product of its mass and the square of its velocity. The opposite of this energy is called the potential energy, the energy of an object at rest. Calculations are as follows:
<span>
KE = mv^2
</span><span>1.8x10^5 J = m(20 m/s)^2
</span><span>m = 450 kg</span>

5 0

3 years ago