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3 years ago

What happens to the speed of light when light travels in matter?

Physics

2 answers:

posledela3 years ago

8 0

Answer:

I would say slightly slower

Explanation:

The speed of light is a lot but when it goes through matter it slows down.

pickupchik [31]3 years ago

4 0

The answer would be B ok man good luck

I hope this helps!

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The propeller on a boat motor is initially rotating at 8 revolutions per second. As the boat captain reduces the boat speed, the

I am Lyosha [343]

Answer: $5.77\ rps$

Explanation:

Given

Initial angular velocity is $\omega_i=8\ rps$

rate of reduction $\alpha=0.9 rev/s^2$

after 17 revolution i.e. $\theta =17\ rev$

using $\Rightarrow \omega_f^2-\omega_i^2=2\alpha\theta$

Insert the values

$\Rightarrow \omega_f^2=8^2-2\times (0.9)\times17\\\Rightarrow \omega_f^2=33.4\\\Rightarrow \omega_f=5.77\ rps$

5 0

3 years ago

Why can't you stand with your heels and back to a wall and then bend over to touch your toes and return to your stand-up positio

snow_tiger [21]

Answer:

Due to the rotating effect created due to opposite acting offset forces of the body weight and the normal reaction from the heels.

Explanation:

We cannot stand on heels with a wall at the back support and then bend over to touch the toes and regain the position back by standing up because we have the center of mass of our body somewhere at the abdominal portion of our body.
So, while standing on our heels we are giving our body only one point to support and balance itself.
On bending the center of mass of our body shifts forward and it is now not vertically in line to the direction of the support reaction from the heels because of the wall at the back we cannot bend our knees and move our weight over our heels for gaining the balance. Due to a difference between the these two opposite forces we have a turning effect called moment on the center of mass of our body. This tries to rotate our body in the forward direction about the center of mass of our body.

7 0

4 years ago

Read 2 more answers

Consider the same roller coaster. It starts at a height of 40.0 m but once released, it can only reach a height of 25.0 m above

poizon [28]

Answer:

The magnitude of the frictional force between the car and the track is 367.763 N.

Explanation:

The roller coster has an initial gravitational potential energy, which is partially dissipated by friction and final gravitational potential energy is less. According to the Principle of Energy Conservation and Work-Energy Theorem, the motion of roller coster is represented by the following expression:

$U_{g,1} = U_{g,2} + W_{dis}$

Where:

$U_{g,1}$ , $U_{g,2}$ - Initial and final gravitational potential energy, measured in joules.

$W_{dis}$ - Dissipated work due to friction, measured in joules.

Gravitational potential energy is described by the following formula:

$U = m \cdot g \cdot y$

Where:

$m$ - Mass, measured in kilograms.

$g$ - Gravitational constant, measured in meters per square second.

$y$ - Height with respect to reference point, measured in meters.

In addition, dissipated work due to friction is:

$W_{dis} = f \cdot \Delta s$

Where:

$f$ - Friction force, measured in newtons.

$\Delta s$ - Travelled distance, measured in meters.

Now, the energy equation is expanded and frictional force is cleared:

$m \cdot g \cdot (y_{1} - y_{2}) = f\cdot \Delta s$

$f = \frac{m \cdot g \cdot (y_{1}-y_{2})}{\Delta s}$

If $m = 1000\,kg$ , $g = 9.807\,\frac{m}{s^{2}}$ , $y_{1} = 40\,m$ , $y_{2} = 25\,m$ and $\Delta s = 400\,m$ , then:

$f = \frac{(1000\,kg)\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (40\,m-25\,m)}{400\,m}$

$f = 367.763\,N$

The magnitude of the frictional force between the car and the track is 367.763 N.

7 0

4 years ago

The lesser the mass, the greater the acceleration for the given value of force. Why does this happen?

Tju [1.3M]

Newtons law states F=ma
so F/m=a
in addition it makes logical sense the lighter an object the easier it is to accelerate its velocity form 0 to some quantity

5 0

3 years ago

What causes plastic flow to occur?

FinnZ [79.3K]

The answer to this is c. High pressure causes plastic flow to occur.

7 0

3 years ago