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3 years ago

Water is boiling in a clear pot, as shown in the picture.

Physics

2 answers:

UNO [17]3 years ago

8 0

I believe the answer is <span>A</span>.

Readme [11.4K]3 years ago

5 0

Answer:

The correct answer is "They are more spread out and moving faster than those at the surface".

Explanation:

The water molecules closest to the burner move faster and are more dispersed because the heat transfer to the water there is greater than at the surface. This causes the water to be more spread out and move faster due to the temperature difference. The higher the temperature, the faster the molecules move and tend to occupy a larger volume.

Have a nice day!

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A light beam travels at 1.94×108 in quartz. The wavelength of the light in quartz is 355 .Part AWhat is the index of refraction

Alja [10]

A) 1.55

The speed of light in a medium is given by:

$v=\frac{c}{n}$

where

$c=3\cdot 10^8 m/s$ is the speed of light in a vacuum

n is the refractive index of the material

In this problem, the speed of light in quartz is

$v=1.94\cdot 10^8 m/s$

So we can re-arrange the previous formula to find n, the index of refraction of quartz:

$n=\frac{c}{v}=\frac{3\cdot 10^8 m/s}{1.94\cdot 10^8 m/s}=1.55$

B) 550.3 nm

The relationship between the wavelength of the light in air and in quartz is

$\lambda=\frac{\lambda_0}{n}$

where

$\lambda$ is the wavelenght in quartz

$\lambda_0$ is the wavelength in air

n is the refractive index

For the light in this problem, we have

$\lambda=355 nm\\n=1.55$

Therefore, we can re-arrange the equation to find $\lambda_0$ , the wavelength in air:

$\lambda_0 = n\lambda=(1.55)(355 nm)=550.3 nm$

4 0

4 years ago

A ball is dropped from the top of a building. What is the velocity of the ball after 4.2 seconds

Svetach [21]

Answer:

41.16 m/s

Explanation:

Final velocity is equal to gravity multiplied by time; v = gt

Gravity is always 9.8 m/s/s (m/s^2), so

v = 9.8 * 4.2

v = 41.16

5 0

3 years ago

010) Identify the true statement. Group of answer choices The height of waves is determined by wind strength and fetch. Wave bas

AlekseyPX

Answer:

The height of the wave is determined by the wind strength and fetch.

Explanation:

The height of the wave is determined by the wind strength and fetch.

The more the strength and the more the fetch size the more will be the height of the wave.

Remember as the wave approaches the coast its wavelength decreases and the wave height increases, whereas when the wave goes away from the coast its wavelength increases and height decreases.

7 0

3 years ago

Which equation shows the mathematical relationship between the frequency and the period of a wave?

mihalych1998 [28]

Answer:

d,.......just did it in a.pex

8 0

3 years ago

Read 2 more answers

In a good hit, a baseball and bat are in contact with each other for about 1 millisecond. In the first game of the 2012 World Se

kramer

Answer:

Explanation:

100 mph = 100 x 1760 x 3 / ( 60 x 60 )

= 146.67 ft / s

70 mph = 70 x 1760 x 3 / ( 60 x 60 )

= 102.67 ft/s

Let mass of the ball = m .

The ball which was moving with a velocity of 146.67 ft/s is turned back by the action of force of bat on the ball and it moved in opposite direction with velocity of - 102.67 ft/s ( - ve sign due to reversed direction )

If m be the mass of ball

change in momentum = m x 146.67 - ( - m x 102.67 )

= m x 146.67 + m x 102.67

= 249.34 m

Change in momentum = impulse = force x time

Putting the given values

249.34 m = force x 1 x 10⁻³ ( time = 10⁻³ s )

force = 249.34 m x 10³ poundal .

Here m is mass of the ball in lb .

3 0

4 years ago