Plz help it's physics really easy

Answer:

There are 2.71x10⁴ wavelengths between the source and the screen.

Explanation:

The number of wavelengths (N) can be calculated as follows:

[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]    

Where:

[tex]d_{g}[/tex]: is the distance in glass = 2.25 mm

[tex]d_{a}[/tex]: is the distance in air = 1.50 cm - 0.225 cm = 1.275 cm

[tex]\lambda_{g}[/tex]: is the wavelength in glass

[tex]\lambda_{a}[/tex]: is the wavelength in air = 620 nm

To find the wavelength in glass we need to use the following equation:

[tex] n_{g}*\lambda_{g} = n_{a}*\lambda_{a} [/tex]

Where:

[tex]n_{g}[/tex]: is the refraction index of glass = 1.80

[tex]n_{a}[/tex]: is the refraction index of air = 1

[tex] \lambda_{g} = \frac{\lambda_{a}}{n_{g}} = \frac{620 nm}{1.80} = 344.4 nm [/tex]

Hence, the number of wavelengths is:

[tex] N = \frac{d_{g}}{\lambda_{g}} + \frac{d_{a}}{\lambda_{a}} [/tex]

[tex] N = \frac{2.25 \cdot 10^{-3} m}{344.4 \cdot 10^{-9} m} + \frac{1.275 \cdot 10^{-2} m}{620 \cdot 10^{-9} m} [/tex]                                    

[tex] N = 2.71 \cdot 10^{4} [/tex]

Therefore, there are 2.71x10⁴ wavelengths between the source and the screen.

I hope it helps you!

Answer: A decrease in acceleration causes the mass to increase.

Explanation:

Let's rewrite this as:

"For a constant force F, we can see that heavier objects accelerate less"

Then, as the mass increases, the acceleration of the object decreases.

This is known as an inverse relationship between acceleration and mass.

By second Newton's law we have that:

F = m*a

Force equals mass times acceleration.

So if the force is constant, we can write it as:

a = F/m.

In this equation, we can see that, if the acceleration decreases and F remains constant, then the mass m must increase (because it is in the denominator)

Then the correct option is:

A decrease in acceleration causes the mass to increase.

Answer:

There is a negative correlation between mass and acceleration.

Explanation:

Facundo is wrong. I got this wrong thanks to Facundo!

Answer:

Ocean phytoplankton

Explanation:

The sea and ocean creates oxygen from the plants (sea creatures) that exist there. These plants generate oxygen when used as a-product of photosynthesis, a mechanism that transforms carbon dioxide through sunlight into carbohydrates that the body(plants) can use for nutrition.

Answer:

Yes, the answer to the question is correct

Answer:

Here's what I know, As scientist discovered that Science is the method of learning everything about the natural world.

but your answer is quite correct above(◕ᴗ◕✿)

Answer:

the light relflects off them and creates a image

Answer:

When photons - rays of light - coming from an object (your smiling face, for example) strike the smooth surface of a mirror, they bounce back at the same angle. Your eyes see these reflected photons as a mirror image.... If a smooth surface absorbs the photons, they can't bounce back and there will be no reflection.

Explanation:

*Hope this helps*

Answer:

the answer is c

Explanation:

because if the force of gravity increases its not gonna change its weight it will just float

Answer:

B

Explanation:

Weight is the amount of force gravity is exerting on something, so if gravity's force increases, weight would increase as well

Answer:

Meter

Explanation:

The competition between the three quarterbacks is with respect to how far the ball would be thrown by each person, which is the distance covered by the ball. The thrown ball is an example of projectile, which would move over a certain distance.

With respect to the measure to be used in the competition, the appropriate SI unit is meter. This is the measure of length or distance covered.

Answer:110

Explanation:

We have,

Speed = 8 m/s

Time = 17 seconds

Now,

Speed = Distance/Time

★ Substituting the values in the above formula,we get:

⇒ 8 = Distance/17

⇒ Distance = 8 × 17

⇒ Distance = 136 m

Hence,the distance covered by a whale is 136 m .

Answer:

The absolute pressure of the system is 12.7 psia.

Explanation:

Let suppose that system works at an atmospheric pressure of 14.7 psia, the absolute pressure is equal to the atmospheric pressure minus vaccum pressure, that is:

[tex]p_{abs} = p_{atm} - p_{vac}[/tex]

Where:

[tex]p_{abs}[/tex] - Absolute pressure, measured in pounds per square inch.

[tex]p_{atm}[/tex] - Atmospheric pressure, measured in pounds per square inch.

[tex]p_{vac}[/tex] - Vacuum pressure, measured in pounds per square inch.

Given that [tex]p_{atm} = 14.7\,psia[/tex] and [tex]p_{vac} = 2\,psia[/tex], the absolute pressure of the system is:

[tex]p_{abs} = 14.7\,psia-2\,psia[/tex]

[tex]p_{abs} = 12.7\,psia[/tex]

The absolute pressure of the system is 12.7 psia.

Answer:

While centripetal force focuses towards the centre of a rotating path, the centrifugal force is just opposite to this, meaning it exerts a force to liberate a body from ...

Centripetal force is an inward force and centrifugal force is an outward force.

Centrifugal force is often referred to as inertial force or fictitious force.

More items...

Explanation:

Answer:

See below

Explanation:

Distance = 27 + 13 = 40 km

Displacement = 27 - 13 = 14 km

Answer:b

Explanation:

Answer:

Acceleration,  [tex]767.08\ m/s^2[/tex]

Explanation:

Given that,

Height from a ball falls the ground, h = 17.3 m

It is in contact with the ground for 24.0 ms before stopping.

We need to find the average acceleration the ball during the time it is in contact with the ground.

Firstly, find the velocity when it reached the ground. So,

[tex]v^2=u^2+2ah[/tex]

u = initial velocity=0 m/s

a = acceleration=g

[tex]v=\sqrt{2gh} \\\\v=\sqrt{2\times 9.8\times 17.3} \\\\v=18.41\ m/s[/tex]

It is in negative direction, u = -18.41 m/s

Let a is average acceleration of the ball. Consider, v = and u = -18.41 m/s.

[tex]a=\dfrac{v-u}{t}\\\\a=\dfrac{0-18.41}{24\times 10^{-3}}\\\\a=767.08\ m/s^2[/tex]

So, the average acceleration of the ball during the time it is in contact is [tex]767.08\ m/s^2[/tex].

Answer:In short yes in long

Explanation:yes all substances can exist in any of these three states. In addition to existing in one of the three states, matter can also undergo a change of state. A change of state occurs when matter is converted from one state to another state for example when a liquid is converted to a gas or a solid is converted to a liquid.

Answer:

It is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.

Explanation:

From Newton's law of inertia, it states that: An object at rest or in constant motion will continue in it's present state unless it is acted upon by an external force.

Which means that a single object by itself cannot move anywhere unless it is acted upon by an external force..

Thus, it is wrong to say that "a single object all alone is moving" simply because it goes against Newton's law of inertia.

Answer:

kinetic energy

Explanation:

A wind turbine transforms the mechanical energy of wind into electrical energy. A turbine takes the kinetic energy of a moving fluid, air in this case, and converts it to a rotary motion. As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator

Answer:

Call a treatment service. Seek out a healthcare professional. Lastly, report the issue to the local authorities.

Why did I choose these?

You call the treatment services to take care of the person.

You seek out a healthcare professional to get him/her back in shape.

Then you report the issue so that nobody will be endangered by the person that is abusing alcohol. Many accidents occur because of this and that is why you report it.

Explanation:

Answer:

Once used as a energy source they cannot be charged/used again.

Explanation:

Complete question is;

Li and Raj are playing football. They take turns trying to run past each other with the football. Li weighs 125 pound and Raj weighs 175 pounds. Li discovers that if he changes direction quickly when running, he can always dodge out of the way before Raj can tackle him.

Why is Li able to avoid Raj’s tackle? Choose the best description.

A) Raj has more mass and therefore more inertia, so he can change his motion more easily than Li.

B) Raj has more mass and therefore less inertia, so he can change his motion more easily than Li.

C) Li has less mass and therefore more inertia, so he can change his motion more easily than Raj.

D) Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Answer:

Option D - Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

From Newton's first law of motion which is known as law of inertia, an object will remain at rest or continue in constant motion unless an external force acts upon it. This means that Inertia is simply the resistance of an object to any change in its state of rest or motion.

This means that the larger the mass of the object, the more resistance the object will have from an external force. Similarly, the smaller the object, the less resistance it will have from an external force.

Therefore, we can see that larger mass means larger resistance and in turn larger inertia while smaller mass denotes smaller resistance and in turn smaller inertia.

Now, from the question,Li weighs 125 pound and Raj weighs 175 pounds. So, Li has lesser mass than Raj, and so he also has less inertia. Thus, he can change his motion more easily than Raj due to that.

Answer:

Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.

Explanation:

i did the test

Answer:

2 m/s^2

Explanation:

acceleration formula: a=(v-v0)/t

a=(24-12)/6=2

A free-falling object has a consrant force acting on it . . .  the force of gravity, or what technical experts refer to as its "weight".

Since the object has a constant force acting on it, it must constantly accelerate according to Newton's 2nd law of motion. The way this acceleration reveals itself, the object's speed is constantly increasing.

Since the object is speeding up as it falls, there are a few weird things that happen:

 --  It will fall 2 meters in less than double the time for 1 meter.

 --  It will fall 3 meters in less than triple the time for 1 meter.

 --  It will fall 4 meters in less than quadruple the time for 1 meter, and less than double the time for 2 meters.

 --  It will fall 1 meter near the bottom in less time than 1 meter near the top.

None of the choices exactly answers the question.

Choices ' a ' and ' d ' are false statements.

Choice-b is a true statement, but it isn't a "Yes".

Choice-c  is kind of confused, but is probably the one you should select.

Answer:

Velocity (v) can be calculated via v = gt, where g represents the acceleration due to gravity and t represents time in free fall. Furthermore, the distance traveled by a falling object (d) is calculated via d = 0.5gt^2.

Maybe sea or onshore breeze

It develops due to the difference of air pressure greater by the different temperature of the water and land

Answer:

62400 cm

Explanation:

1 m = 100 cm

624m = 62 400 cm

Answer:

I think they use it at night because they want to avoid involving themselves in road accident while crossing the street. When there are reflective strips on their clothes, drivers do notice them even at far ends of the street since the strips will reflect the rays from the car lights to the driver,hence, the driver notifies that there is a pedestrian crossing and therefore slows down.

Answer:

It would be 2.2 if you have to round the five to the one but if your not rounding the number, it'd be 2.1.

Explanation: