Why is the vertical component of velocity ?

Answer:

-0.9 m/s²

Explanation:

Given:

Δx = 500 m

v₀ = 50 m/s

v = 40 m/s

Find: a

v² = v₀² + 2aΔx

(40 m/s)² = (50 m/s)² + 2a (500 m)

a = -0.9 m/s²

A bullet train moves with an initial velocity of 50 m/s final velocities of 40 m/s, and it covers 500 meters, so the acceleration will be -0.9 m/s².

Acceleration is the term that describes the pace at which the speed and direction of a motion change over time. Anything moving faster or slower inside a straight line is said to be accelerating. Even if the speed is constant, travel on a circle accelerates also because the direction of motion is always changing.

From the given information in the question,

Initial velocity, u = 50 m/s

Final velocity, v = 40 m/s and,

Distance, s = 500 meters

Use equation of motion to find the acceleration of the train :

v² - u² = 2as

(40)² - (50)² = 2(a)(500)

a = -900/1000

a = -0.9 m/s².

Therefore, the acceleration of the bullet train is  -0.9 m/s².

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Answer:

true

Explanation:

if you stretch a lot and try different/harder things you will become more flexible

Answer:

Explanation:

Momentum is defines as the product of mas of a body and its velocity,

Given

Mass of Being 747 =

Velocity = 253m/s

Required

Momentum of the body

Substituting the required value into the formula;

Momentum = 4,082,331.33 kg * 253

Momentum = 1,032,829,826.49 kgm/s

Therefore the momentum of the body is 1,032,829,826.49kgm/s

The momentum of fully loaded Boeing 747 is  [tex]1.032 \times 10^{9} \;\rm kg.m/s[/tex].

Given data:

The mass of fully loaded Boeing 747 is, m = 4,082,331.33 kg.

The velocity of cruising is, v = 253 m/s.

The concept of momentum says that the impact created by the applied force is known as momentum. It is expressed as product of mass and velocity.

Then the expression is,

p = mv

Soling as,

[tex]p = 4,082,331.33 \times 253\\\\p=1.032 \times 10^{9} \;\rm kg.m/s[/tex]

Thus, we can conclude that the momentum of fully loaded Boeing 747 is [tex]1.032 \times 10^{9} \;\rm kg.m/s[/tex].

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Answer:

it is the impact of a meteorite, volcanic activity, or an explosion.

Answer:

-1.5 m/s^2

Explanation:

Acceleration is Final velocity - Initial Velocity/Time (seconds)

30-48= -18

-18/12 = -1.5

-1.5 m/s^2

Oh it has ! It has ! That's exactly where you get all the energy you use to think, breathe, and move.

Answer:

A  identity

Explanation:

got it right on edge

Answer:

The identity of the H2O is what stays the same. The singular answer is A. identity of the H2O

Explanation:

I just took the test and made a 100%! I know that you can too bb i love you!! I hope you have a really great day.

Explanation:

Formula:

F*255.92778=K

83 F *255.92778=301.48k

therefore the answer is:

301.48K

Explanation:

Energy is involved in changes of state because the energy of particles of matter determines the matter's state.

Changes of state are physical changes in matter.

Energy must be absorbed to change a liquid to a gas.

Sublimation is solid to gas (no liquid involved).

1 D

2 False

3 True

4 D

Answer:

[tex] \boxed{ \sf{See \: below}}[/tex]

Explanation:

Seismograph is a computerized instrument that measures the intensity , origin and speed of the earthquake.

Hope I helped!

Best regards! :D

~[tex] \sf{TheAnimeGirl}[/tex]

Answer: C and D

Explanation: I just took took the test

Answer:

The correct answers are C and D.

Explanation:

The friction of the car's moving parts rubbing up against each other and the thermal energy created by the combustion of the car's fuel both create heat that will take away from the energy from the fuel that is transferred to the car's wheels.

In short, some of the energy was not transferred to the wheels because the gears and the combustion create heat.

Answer:

A flip is also called a reflection

Answer:

B. What are the base units of electric current?

To find out that the electric current is a vector or scalar quantity, Tim should ask what is the symbol for electric current. Hence, option C is correct.

A physical quantity whose size is a complete description of it. Volume, density, speed, energy, mass, and time are a few examples of scalars. Other quantities, like as force and velocity, are referred to as vectors since they have both magnitude and direction.

Real numbers that are typically positive but not always characterize scalars.

In physics, a vector is a quantity with both magnitude and direction. It is often represented by an arrow whose length is proportional to the magnitude of the quantity and whose direction is the same as that of the quantity. A vector does not have position, while having magnitude and direction. In other words, a vector's shape is unaltered if it is shifted parallel to itself as long as its length is unaltered.

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Answer:

a = 0.264 [m/s^2]

Explanation:

We can find the deceleration value using the following formula of kinematics:

[tex]v_{f} =v_{o} - (a*t)[/tex]

The final speed is taken as zero as the rider stops completely and the acceleration sign in the equation is taken as negative as the rider is slowing down.

Vf = final velocity = 0

Vo = initial velocity = 4.6 [m/s]

t = time = 0.29 [min] = 0.29*60 = 17.4 [s]

0 = 4.6 - (a*17.4)

-4.6 = - 17.4*a

a = 0.264 [m/s^2]

Answer:

See explanation

Explanation:

A frame of reference simply refers to a set of coordinates which is used to determine the position and velocity of objects all the objects found in that particular frame. The person inside the car and standing by the highway are in different frames of reference.

Newtons first law of motion states that an object will continue to be at rest or in a state of uniform velocity until it is acted upon by an external force.

Newtons second law states that rate of change of momentum is directly proportional to the impressed force.

Newtons third law states that action and reaction are equal and opposite.

The action of applying brakes leads to an equal reaction of a sudden forward movement. Seat belts help to prevent the occupants of a car from being injured by the sudden stoppage of the car.

Force is simply defined as a push or pull.

Balanced forces do not lead to acceleration of a body but an unbalanced for leads to acceleration of a body.

strong nuclear force, electromagnetic force, weak nuclear force and gravity

Power is the rate of doing work while week is said to be done when the force applied moves a distance in the direction of the force. Power is defined as work/time.

Answer:

Increase the work being done or decrease the time in which the work is completed

Explanation:

I got it right on the quiz i just took :)

Answer:

Amplitude is one-half the height of the wave from peak to trough. Wavelength and frequency are inversely proportional: As the wavelength increases, the frequency decreases.

I hope this helps in a way...

Answer:

B. 2.77 x [tex]10^{-4}[/tex] N

Explanation:

The required force can be calculated by:

F = [tex]\frac{Kq_{1}q_{2} }{d^{2} }[/tex]

Where F is the force between the particles, K is the coulomb's constant (9 x [tex]10^{9}[/tex] [tex]Nm^{2}/C^{2}[/tex]), [tex]q_{1}[/tex] is the charge on the first particle, [tex]q_{2}[/tex] is the charge on the second particle and [tex]d^{2}[/tex] is the distance between the particles.

So that:

F = [tex]\frac{9*10^{9}*2.15*10^{-9} *3.22*10^{-9} }{(0.015)^{2} }[/tex]

  = [tex]\frac{6.2307*10^{-8} }{(2.25*10^{-4} }[/tex]

  = 2.7692 x [tex]10^{-4}[/tex]

 The force between the particles is 2.77 x [tex]10^{-4}[/tex] N.

Answer:

b

Explanation:

a pex

✓52 - ✓117 + 4✓13 =

✓4×13 - ✓9×13 + 4✓13 =

2✓13 - 3✓13 + 4✓13 =

-✓13 + 4✓13 = 3✓13

Answer = 3✓13

If you have any questions about my answer, ask me.

Answer:

I hope that,it help you.

Answer: 15,115 J

Explanation: --APEX-- JUST TOOK THE TEST

Answer:

15,115 J

Explanation:

Answer:

Mar's orbital path is more than that of Earth, thus it takes more number of days to orbit around the sun.

Explanation:

Mars takes over 500 days to orbit all the way around the sun than Earth because its distance from the sun (228 million kilometers) is greater than that of Earth (150 million kilometers) which takes it 365 days.

Planets that orbit closer to the sun take shorter time to orbit around the sun because the cover a shorter orbital distance and orbit faster than those planets further from the sun.

For example

Using Earth's distance from the sun, 150 million kilometers and the number of days taken to orbits the sun ,365 days and the distance Mars is from the Earth, 228 million kilometers, you can approximate the time Mar takes to orbit the sun as:

Earth 150 million kilometers  = 365 days

Mars  228 million kilometers= ?

Cross product ; (228 *365) /150 =555 -----(a value closer to that in the question)

Answer:

There are 2.5 x 10¹⁸ electrons in 0.4 C.

Explanation:

The charge of one electron = 1.602 x 10⁻¹⁹ C

Therefore, the number of electrons in 0.4 C is calculated as follows;

1.602 x 10⁻¹⁹ C -------------> 1 electron

0.4 C --------------------------> x

x = (0.4 ) / (1.602 x 10⁻¹⁹)

x = 2.5 x 10¹⁸ electrons

Therefore, there are 2.5 x 10¹⁸ electrons in 0.4 C.

Answer:

speed

Explanation:

speed is rate of change of distance with time in no specific direction.

Answer:

a=-5.3m/s2

Explanation:

F=-20N

m=3.75kg

a=?

F=am /:m

a=F/m

a=-20N/3.75kg

a=-5.3m/s2

Answer:

The answer is 0.019232211646643. We assume you are converting between moles Chromium and gram. You can view more details on each measurement unit: molecular weight of Chromium or grams The molecular formula for Chromium is Cr. The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles Chromium, or 51.9961 grams. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between moles Chromium and gram. Type in your own numbers in the form to convert the units!

Answer:

0.019232211646643

Explanation:

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