A car starting from rest accelerates at a rate of 8.0 m/s/s. What is its final speed at the end of 4.0 seconds?

Answer:

His first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. This is normally taken as the definition of inertia.

Explanation:

Answer:

It states that: If a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it acted upon by a force

Explanation:

Answer:50mph

Explanation:

Complete question :

A car accident my rolls off a cliff as it leaves the cliff it has a horizontal velocity of 13 ms it hits the ground 60 m from the shoreline calculate the height of the cliff

Answer:

104.59 m

Explanation:

Given that:

Horizontal Velocity = 13 m/s

Horizontal distance = 60 m

To obtain the height of the cliff :

We use the Relation :

S = ut + 0.5at²

t = time ; u = initial velocity ; S = height

To obtain t ;

Speed = distance / time

Horizontal distance / speed = time

Time = 60 / 13

Time = 4.62 seconds

The height of cliff :

u = 0

Hence ;

S = ut + 0.5at²

S = 0 + 0.5(9.8) * 4.62^2

S = 104.58756

Height of cliff = 104.59 m

Answer:

B. its speed increases

Explanation:

A brass rod is encased in aluminium. The speed of a sound wave in this decreases when it moves from the aluminium into the brass medium. Thus, the correct option is A.

Sound travels in different mediums in the form of waves. The speed of sound is the speed with which the sound wave travels in a medium. The speed of the wave depends on the density and the elasticity of the medium through which the sound waves travel. In general, the sound wave travels faster in the liquid mediums in comparison to the gas medium and these are quicker in solid mediums than in liquid mediums. Thus, the greater the elasticity and the lower the density of the waves, the faster the sound waves travel in that medium.

The speed of sound in aluminium is 5100m/s and in the brass medium, it is 6,923. So, if the sound wave is moving from aluminum metal to the brass medium, we can clearly observe that there is decrease in the speed of sound. So, we can say here that is the speed is decreases.

Therefore, the correct option is A.

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Answer:4s^-1

Explanation:Tangential Acceleration=v^2/r=(20)²/100=400/100

Answer:

V₁ = 200 mi/h

Explanation:

To do this, we need to analyze the given data.

We have a total distance and time of 1500 mi and 6.5 h. We also know that the second plane goes 50 mi/h faster than the first plane, (V₂ = V₁ + 50). The firsts 500 miles were on the first plane and the remaining 1000 mi with the second plane.

Using the expression of distance, and assuming a constant speed in both planes we have:

d = V * t   (1)

Replacing this expression for both planes we have:

d₁ = V₁ * t₁

d₂ = (V₁+50) * t₂

WE are missing several data, because we do not know the times for each plane, but we can have a clue.

The total time of flight was 6.5 h, this is equivalent to just sum both times of both planes, so:

t = t₁ + t₂   (3)

From the expressions of distance for both planes, we can solve for time, and then replace in the above expression of the total time. In that way we can solve for the speed of the plane. Let's solve for both times in the planes:

t₁ = d₁ / V₁ = 500/V₁    (4)

t₂ = d₂ / V₁+50 = 1000/ V₁ + 50   (5)

Now, all we have to do is replace (4) and (5) into (3) and solve for V₁:

6.5 = [(500/V₁) + (1000/V₁ + 50)

6.5 = [500*(V₁+50) + 1000V₁ / V₁(V₁+50)]

6.5 = [500V₁ + 25000 + 1000V₁ / V₁² + 50V₁

6.5(V₁² + 50V₁) = 1500V₁ + 25000

6.5V₁² + 325V₁ - 1500V₁ - 25000 = 0

6.5V₁² - 1175V₁ - 25000 = 0

From here, we use the quadratic equation to solve for V₁:

X = 1175 ± √(1175)² + 4 * 6.5 * 25000 / 2 * 6.5

X = 1175 ± √1380625 + 650000 / 13

X = 1175 ± 1425 / 13

X₁ = 1175 + 1425 / 13 = 200

X₂ = 1175 - 1425 / 13 = -19.23

So, it's very clear that the speed cannot be negative, so we stick with the first value. Therefore the speed pf the first plane is:

Hope this helps

The speed of the first plane is 77.02 mph.

The given parameters:

Let the average speed of the first plane = v

Then, average speed of the second plane = 50 + v

The speed of the first plane is calculated as follows;

[tex]\frac{500}{v} + \frac{100}{50 + v} = 6.5\\\\\frac{500(50 + v) + v}{v(50 + v)} = 6.5\\\\500(50 + v) + v = 6.5(50v + v^2)\\\\25000+ 500v + v = 325 v + 6.5v^2\\\\6.5v^2 -176 v - 25000 = 0\\\\a = 6.5, \ b = -176, \ c = -25000\\\\v = \frac{-b \ +/- \ \ \sqrt{b^2 - 4ac} }{2a} \\\\v = 77.02 \ mph[/tex]

Thus, the speed of the first plane is 77.02 mph.

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Answer:Stronger they are

(I think...)

Answer:

a) 24.33 m of distance.

b) 34.55° east of the south.

Explanation:

The question is incomplete. The whole exercise is the following:

"Ricardo and Jane are standing under a tree in the middle of a pasture. An argument ensues, and they walk away in different directions. Ricardo walks 28.0 m in a direction 60.0° west of north. Jane walks 12.0 m in a direction 30.0° south of west. They then stop and turn to face each other.

(a) What is the distance between them?

(b) In what direction should Ricardo walk to go directly toward Jane?"

Now that we know what we need to do in this question, let's head for every part of the problem.

a) Distance between Ricardo and Jane

In this case, we need to analyze the given data:

Ricardo (which we will call R) is 28 m from the starting point at 60° west of north, and Jane (J) is 12 m at 30° south of west. So the distance between them, will be the point where they both stop and face each other. This point can be seen in the image attached (See picture).

Let's call the distance between them as "D", to get the distance of D, according to the picture will be:

D = J - R   (1)

However, as they are facing in different angles and directions, we cannot do the difference of their values distance just like that. In order to do that, we need to calculate the components in the "x" and "y" axis of each vector. In that way, we can get the components of x and y of the Distance D, and then, the whole distance between them will be:

D = √Dx² + Dy²     (2)

So, let's get the components of x and y of R and J.

For Ricardo (R):

Rx = R sin60° = 28 sin60° = -24.25 m

Ry = R cos60° = 28 cos60° = 14 m

The sign "-" it's because R it's on the second quadrant, therefore in x, we'll have to add the negative.

For Jane (J):

Jx = J cos30° = 12 cos30° = -10.39 m

Jy = J sin30° = 12 sin30° = -6 m

Again, the negative is added because J is on the third quadrant.

Now that we have the components, let's calculate vector D using expression (1):

Dx = -10.39 - (-24.25) = 13.86 m

Dy = -6 - 14 = -20 m

Now, using expression (2) we can finally know the distance between Jane And Ricardo:

D = √(-20)² + (13.86)²

This is the distance between Jane and Ricardo.

b) Direction of Ricardo walking to Jane

In this case, we already have the components of x and y of the distance between them, so, to know the direction:

Tanα = Dy/Dx

α = tan⁻¹ (Dy/Dx)

Replacing the values we have:

α = tan⁻¹ (-20/13.86)

α = 55.45°

Which should south of east or:

β = 90 - 55.45

Ricardo should walk 34.55° east of south

Hope this helps

Answer:

Oxygen and nutrients from the mother's blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby's liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.

Answer:

salt dissolving

Explanation:

hope it helps

Answer:

A) Blackbody radiation

Explanation:

i just took the test and this was my answer

Answer:

constructive interference

Explanation:

just did it

Answer:

Since the Kinetic energy forumla is K=(1/2)mv^2 if you double the mass the kinetic energy of the object also doubles. for example if your object has a mass of 3 and a velocity of 2 then its K.E. equals 6, if you then double its mass the kinetic energy now equals 12. A good analogy would be something like a bowling ball, if you throw a 12 pound ball at the same speed as a 6 pound ball, the force from the 12 pound ball would be exactly double to the 6 pound ball.

Explanation:

man, english isnt my strong suit. you have all you need here to make a A level answer just fix grammar as needed. I cant imagine this is a high level physics class so in reality just make it so it would be plagirsm detected.

Also a side note this may help you in the future. if u double its velocity its K.E. actually quadruples since V is squared.  

Answer:

gravity is the force by which a planet or another body draws objects towards its Centre. the force of gravity keeps all of the planets in an orbit around the sun.

Explanation:

what is gravity made of?

gravity are made of proposed gravity parts that are made quantum particles which called gravitational anywhere there is gravitation there is gravity like on Earth in the Solar System most importantly in the minisclue infant and intervention universe .

Answer:

Venus is only 95% the size of Earth, and 81% of its mass. With the smaller size and mass, the force of gravity pulling you on the surface is lower. To get your weight on Venus, just multiply your current weight by 0.9. That's why 100 pounds becomes 90 pounds

If the mass of an object is 35kg on Venus Its mass on the Sun remains the same hence the object's mass om sun in 35 kg. The mass of an object is an intrinsic property and remains the same regardless of the gravitational field.

The mass of an object does not change depending on its location. The mass of an object is an intrinsic property and remains the same regardless of the gravitational field it is in or its location within the universe.

However, it is important to note that an object's weight, which is the force of gravity acting on it, would be different on Venus and the Sun due to the variations in gravitational pull.

Therefore, if the mass of an object is 35 kg on Venus, its mass would still be 35 kg on the Sun.

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Answer:

Show the wave

Explanation:

Answer:

The number of complete wavelengths in a given unit of time is called frequency (f). As a wavelength increases in size, it's frequency and energy (E) decrease. From these equations you may realize that as the frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength get longer.

Explanation:

I majored in Physics

Answer:

3.06m/s² to the east

Explanation:

Given parameters:

Mass of car = 2.5 x 10³kg

Force acting on the car  = 7.65 x 10³N

Unknown:

Acceleration of the car  = ?

Solution:

From Newton's second law of motion:

      Force  = mass x acceleration

   Acceleration  = [tex]\frac{Force }{mass}[/tex]   = [tex]\frac{7.65 x 10^{3} }{2.5 x 10^{3} }[/tex]    = 3.06m/s² to the east

Answer:

5.00 x 10^9 j

Explanation:

mass = 100 kg

speed / velocity = 10 km/s x 1000 = 10,000m

K.E =

[tex] \frac{m{v}^{2} }{2} [/tex]

10,000x 100/ 2

= 5000000000

= 5.0 x 10^9j

Velocity includes both speed and direction.

Velocity of a particle is its speed and the direction in which it is moving.

It can also be described as the instantaneous rate of change of the particle's distance traveled, and the direction in which the distance is changing, velocity is basically speeding in a specific direction. It is a vector quantity, which means we need both magnitude (speed) and direction to define velocity. The SI unit of it is metre per second (ms-1). If there is a change in magnitude or the direction of the velocity of a body, then it is said to be accelerating.

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Answer:

Starting from the beginning.

There is a radio signal that is received by the radio.

The radio interprets the signal and produces a current in response to it.

That current goes to a membrane that oscillates producing sound, the oscillation of the membrane is the first mechanical energy event here.

These oscillations can travel in material mediums, for example, the air. Then there is a production of waves (soundwaves) that travel in the air (second event).

Those waves now hit the wall that separates you and your neighbor, as the wall is made of a material, the soundwaves can travel through it, but they will be dispersed (a part of the waves rebounds on the wall, and another part is dissipated as the wave travels through the wall), there is also a transmitted part of the wave, that is now in your house. (this change of medium will be the third event). Now only the lower frequencies survive, this is why the sound is "muffled".

Those remaining frequencies now travel in your house, and when they reach your ear, your ear sends a signal to your brain and your brain interprets them as sound. The wave interacting with your ear will be the fourth and last mechanical energy event.

Answer:

Explanation:

Simple harmonic motion is the motion that involves the cyclic and periodic motion of an object about a central point or equilibrium position, due to the effect of a restoring force, such that the object has the same maximum displacement during its motion on either side of the equilibrium point

(a) The parameters of the body moving with SHM are;

The amplitude of the motion of the body, a = 10 cm

The frequency of the complete cycles of the motion of the body, f = 100 Hz

The period of the oscillation, 'T', is the time it takes o complete one cycle

T = 1/f

∴ T = 1/100 Hz = 0.01 seconds

(b) The acceleration, a = -A·ω²·sin(ω·t)

Where;

One complete oscillation is given as ω·t = 2·π

Therefore at either end at the maximum displacement, which is at either end of the equilibrium position is reached at half a complete cycle, or ω·t = 2·π/2 = π

At the maximum displacement a = -A·ω²·sin(ω·t) = A·ω²·sin(π) = 0

Therefore, we have;

The acceleration, of the body at the maximum displacement, a = 0 m/s².

Answer:

C) more

Explanation:

because the amplitude of a wave is the maximum displacement of a particle from its rest position, thus, the more energy there is, the higher the particle is displaced

hope this helps, if not, please report it so that someone else can try it

The greater a wave's amplitude, the more energy the wave carries. The correct option is C.

Due to the fact that the amplitude of a wave represents the maximum displacement of a particle from its rest position, the higher the displacement of the particle, the more energy there is.

The maximum displacement or distance made by a point on a vibrating body or wave relative to its equilibrium location is known as the amplitude in physics.

The wave's deviation from its mean position is referred to as amplitude. It measures the vertical separation of the peak (also known as the crest or trough) from the mean position. The distance between the center line (or the still position) and the top or bottom of a wave's crest or trough is known as the amplitude.

Therefore, the correct option is C: more.

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Answer:

the last one

Explanation:

its the sun when the earth turns towards the sun it gives us heat not solar radiation.