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Answer:

Therefore, Train A is faster with 50km/h and a 5km/h difference

Explanation:

train A

150km/3h = 50km/h

train B

180km/4h = 45km/h

Answer: A. silicon and oxygen

Explanation:

The two most abundance elements in earth's crust are silicon and oxygen.

The most abundant element in earth's crust is Oxygen (O) which has a percentage composition of 46.6%.  Oxygen is mainly present as silicates, carbonates, sulphates etc.

The second most abundant element in earth's crust is Silicon (Si) which has a percentage composition of 27.7% . Silicon is present in the form of silicates.

The third most abundant element in earth's crust is aluminium (Al) which has a percentage composition of 8.1 %.

The fourth most abundant element in earth's crust is Iron (Fe) which has a percentage composition of 5.0 %.

Answer:

A

Explanation:

Answer:

[tex]mv \div r \\ mass \times velocity \div radius[/tex]

Answer:

a. 1100 meters.

b. Between B and C

c.1. Between point D and E

c2. Between point D and E

d. 3.7 m/s.

Explanation:

The girl travels the distance of 1100 meters from starting to the end. There is no motion occurs between B and C due to no change of distance value from 200 meters. Between point D and E, the girls covers 500 meters long distance and also covers fastest distance between point D and E because between point D and E, the girl covers 500 meters distance in 30 seconds which is the highest of all. The average speed of the girls is 3.7 meter/seconds if we divide total distance i.e. 1100 meters by time which is 300 seconds.

Answer:

When two objects in motion hit each other they experience forces that are equal in magnitude and opposite in direction. This force causes one of the objects to speed up or gain momentum and other to slow down or lose momentum.

Answer:

Stress does not cause illness, but restrains the immune system's ability to fight foreign invaders

Explanation:

It's correct :)

The statement is false because as the temperature of water is decreased from 4C to 0C, expansion occurs.

You should understand that this is very weird behavior for any compound ... within a small temperature range, the stuff actually gets bigger as it gets colder.  That's why cubes float in your sody, and bergs float in the ocean.

Water is one of only two known substances that do this.  And if water didn't do it, then life on Earth would not be possible.  

Hmmm....

There is not contraction, Instead expansion occurs .

We know density of water is temperature dependant .

at 4°C water has max density so least volume as density is indirectly proportional to volume.

at 0°C density decreases so volume increases

Answer:

c. root-pry

Explanation:

i did the test

The process by which a seed enters a rock fracture and the expanding roots push to widen the fissures is known as mechanical weathering.

Machine-induced weathering Mechanical weathering, sometimes referred to as physical weathering and disaggregation, causes rocks to break down. Water, whether liquid or solid, is usually present during mechanical weathering. For instance, liquid water may seep through fractures and fissures in rock.

You may get mechanical weathering from

the reduction in pressure produced on by the removal of subsurface rock.

Water freezes and thaws in the granite's crevices.

Salt crystals are developing inside the rock.

cracking brought on the plant roots and exposed by digging animals

The information is ,

Let's say the weathering looks like A.

Now, plants are to blame since a seed that falls into a fracture in a rock and the seed's expanding roots push and widen the original gap

Weathering from mechanical sources and one mechanical weathering mechanism that fractures rocks is the freezing and spreading of ice in rock cracks.

Moreover, mechanical weathering reduces rocks into microscopic fragments, increasing the surface area of the material as a whole.

Hence, the method is mechanical weathering.

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Answer:

jello

Explanation:

it jiggles

Answer:

the rocks have the same amount of thermal energy

Two waves have the same amplitude but they can have different frequencies. The wave with a higher frequency will have greater energy. Therefore, the given statement is correct.

The frequency of electromagnetic waves or any wave can be described as the number of oscillations in one second. The frequency can be represented as per second or hertz.

The wavelength of the wave can be defined as the distance between two crests or troughs on a wave that is separated by a distance known as wavelength. The wavelength of the waves is expressed in meters.

The relationship between frequency (ν) and energy of the wave:

E = hν

The frequency of the waves has a direct relation with the energy of the waves. Therefore, the wave which has a higher frequency will carry greater energy whether they have the same amplitude.

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Answer:

(3 ) friction hope this is correct

Hii!!! The correct answer is true. (:

Answer:

5.47 m/s

Explanation:

p=ma

575=105v

v=575/105

v=5.47 m/s

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Answer:

The correct answer is - C) Jackie may maintain healthy body fat levels.

Explanation:

Jackie has a very active daily and on weekends routine that includes riding the bike, playing volleyball, pushing weeds, and sweeping the porch. The activities that Jackie is performing daily as well as the time that she spends on exercise may help her to maintain body fat levels.

Being physically active helps in maintaining fat levels in the body of an individual, and it is healthy for the individual.

Thus, the correct answer is - C) Jackie may maintain healthy body fat levels.

Answer:

500 N

Explanation:

Since the work done on the spring W = Fx where F = force applied and x = compression length = 0.170 m (since the spring will be compressed its full length when the force is applied)

Since W = 85.0 J and we need to find F,

F = W/x

= 85.0 J/0.170 m

= 500 N

So, the  magnitude of force must you apply to hold the platform stationary at the final distance given above is 500 N.

Answer:

Joules/second^2=(Newton×meter)/second^2.

Solving for mass: Kg= (second^3/ meter^2).

Answer:

option A

Explanation:

the diameter is twice the length of the radius

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Answer:

I think it is difficult to determine what has caused climate change in the distant past because it must have been a long time ago so geologists can't carry out different experiments and figure out what gases the planet had conjured, so geologists can only make predictions based off the evidence they currently have from what the planet looked like before. The planet must have changed over the years, therefore the climate has also changed in the future, so they cannot work with how the planet looked in the past.

Answer:

A. The angle with which the light passes from glass into water is approximately 31.97°

B. The image formed is, real, inverted, and smaller than the object

C. The image distance is 53.2[tex]\overline 6[/tex] cm

The image is real

D. The magnification is approximately 0.182

E. The type of lens required is a concave lens which corrects the focus of a powerful eye lens or a long eyeball

Explanation:

The given parameters for the light wave are;

The refractive index of the glass medium, n₁ = 1.5

The angle of incidence of the light, θ₁ = 28°

The refractive index of water, n₂ = 1.33

A. Let θ₂ represent the angle with which the light passes from glass into water

Snell's law is mathematically stated as follows;

n₁·sin(θ₁) = n₂·sin(θ₂)

According to Snell's law, we have;

1.5 × sin(28°) = 1.33 × sin(θ₂)

sin(θ) = (1.5 × sin(28°))/1.33 = 0.52947920615

∴ θ₂ = arcsin(0.52947920615) ≈ 31.97°

The angle with which the light passes from glass into water, θ₂ ≈ 31.97°

B. Please find attached the drawing of the image created with Microsoft Visio

From the drawing, we have that the image formed is real inverted smaller than the object and between the focus and radius of curvature

C. The location of the object from the mirror, u = 94.0 cm

The focal length of the mirror, f = +34.0 cm

The mirror formula for a concave mirror is given as follows;

[tex]\dfrac{1}{f} = \dfrac{1}{u} + \dfrac{1}{v}[/tex]

Therefore, we have;

[tex]\dfrac{1}{34.0} = \dfrac{1}{94.0} + \dfrac{1}{v}[/tex]

[tex]\dfrac{1}{v} = \dfrac{1}{34.0} - \dfrac{1}{94.0} = \dfrac{15}{799}[/tex]

[tex]\therefore \dfrac{v}{1} = v =\dfrac{799}{15} = 56.2\overline 6[/tex]

The image distance, v = 799/15 = 53.2[tex]\overline 6[/tex] cm

Therefore the image is in front of the mirror, which is a real image

The image is real

D. The given parameters of the object and lens are;

The distance of the object from the lens, u = 65.0 cm

The distance of the image formed from the lens, i = -18 cm

The magnification, M, is given as follows;

[tex]M = \dfrac{-v}{u}[/tex]

Therefore;

[tex]M = \dfrac{-(-11.8)}{65.0} = \dfrac{59}{325} \approx 0.18153846153[/tex]

The magnification, M ≈ 0.182

E. For a person who is near sighted, the light from objects from distant location are almost parallel and are brought to a focus in front of the retina and therefore, they appear blurred

The use of a concave lens is required to correct nearsightedness as it causes the light to appear come from a point before the focus such that the divergent rays of the object refracted through the concave lens comes to a focus at the.

Answer:

Is to add all forces, for example either the gf = gravitational force

Ff= force fiction

Fn= normal force

Thus, fg + ff + fn = y will give you results

Well then the forces you use in your exercises or questions.

The equation for net force is: ΣF = ma

or, ΣF = Δp/Δt.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. The application of force is the location at which force is applied, and the direction in which the force is applied is known as the direction of the force.

A spring balance can be used to calculate the Force. Newton is the SI unit of force.

Hence, net force applied on the object = mass × acceleration

ΣF = ma

It can be written in another from as:

net force applied on the object = change in momentum ÷ time interval

ΣF = Δp/Δt

So, the equation for net force is: ΣF = ma

or, ΣF = Δp/Δt.

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Answer:

The equation a=F/m or the acceleration is equal to the net force of an object divided by that object's mass, is an equation derived and explained by Sir Issac Newton's second law of motion. Newton's second law of motion states that the force of an object is equal to the mass times the acceleration of that object.

Answer:

Explanation:

.

Answer:

The time it takes for the change in the angular velocity to occur is 6.5 seconds

Explanation:

From the question, we have;

The angular acceleration of the wheel, α = -4.20 rad/s²

The final angular velocity of the wheel, ω = -26.0 rad/s

From the information, we have the initial direction of rotation of the wheel = Counterclockwise

The angular displacement while the change occurs = 0 rad/s

Therefore, the initial angular velocity of the wheel, ω₀ = 0 rad/s

We have;

[tex]\alpha = \dfrac{\omega -\omega _0 }{t - t_0}[/tex]

Where;

t - t₀ = The time it takes for the change to occur

[tex]\alpha = \dfrac{\omega -0 }{t - 0}[/tex]

When t₀ = 0, we have;

t - t₀ = t

[tex]\alpha = \dfrac{\omega }{t}[/tex]

[tex]\therefore t = \dfrac{\omega}{\alpha }[/tex]

[tex]\therefore t = \dfrac{-26 \, rad/s}{-4 \, rad/s^2 } \approx 6.5 \, seconds[/tex]

The time it takes for the change in the angular velocity to occur is t - t₀ = 6.5 seconds

Answer:

Pottasium iodide (KI)

Explanation:

product of this reaction is KI. this product is an ionic compound.

Answer:

A) s=1/2at^2

t=√(2s/a)=√(2x400)/10.0)=9.0s

B) v=at

v=10.0x9=90m/s

Answer:

to heat spaces in buildingss

Explanation: