A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, causing the car to slow down with a uniform acceleration of magnitude 3.50 m/s2. How far does the car travel after the driver put on the brakes until it comes to a stop?

Answer:

[tex]KE_{new}=186300 J[/tex]

Explanation:

Given:

[tex]KE=2300J[/tex]   [tex]n=9[/tex]

[tex]v_{new}=n*v_{old}[/tex]

[tex]\frac{KE_{new}}{KE_{old}}=\frac{v^2_{new}}{v^2_{old}}=\frac{(n*v_{old})^2}{v^2_{old}}=n^2[/tex]

[tex]KE_{new}=n^2KE_{old}[/tex]

[tex]KE_{new}=(9)^2(2300)[/tex]

[tex]KE_{new}=186300 J[/tex]

Scientific notation

[tex]KE_{new}= 1.863*10^5 J[/tex]

Hope it helps

Answer:  SI

Explanation:

P(W) = E(J) / t(s)

50/25=2

Answer:

2. ahead of the package.

Explanation:

Using y' - y = ut - 1/2gt², we find the time, t it takes the package to hit the ground. So, u = initial vertical velocity of package = 0 m/s, y = initial position of package = 3970 m, y' = final position of package = 0 m, g = acceleration due to gravity = 9.8 m/s².

Substituting the variables into the equation, we have

y' - y = ut - 1/2gt²

0 m - 3970 m = 0t - 1/2 × (9.8 m/s²)t²

-3970 m = -(4.9m/s²)t²

t² = -3970 m ÷ -4.9 m/s²

t² = 810.2 s²

t = √810.2 s²

t = 28.5 s

Using v = u' + at, we find the horizontal acceleration of the plane. Since the initial horizontal velocity of the package is that of the plane, u' = 162 m/s, v = 0 m/s since the package stops and t = 28.5 s when the package stops.

So, a = (v - u')/t

a = (0 m/s - 162 m/s)/28.5 s

a = -162 m/s/28.5 s

a = -5.68 m/s²

Using v² = u'² + 2as, we find the horizontal distance ,s where the package stops.

So, s =  (v² - u'²)/2a

Substituting the values of the variables, we have

s =  ((0 m/s)² - (162 m/s)²)/(2 × -5.68 m/s²)

= - 162 m²/s²/(-11.36 m/s²)

= 14.26 m

The horizontal distance d the plane moves after releasing the package is d = u't = 162 m/s × 28.5 s = 4617 m

Since d = 4617 m > s = 14.26 m, the plane would be ahead of the package when the package hits the ground.

Answer:

9

Explanation:

Answer:

9

Explanation:

Because its right!

Answer:

1:1

Explanation:

the sphere is an exact copy of the ring so the energy flux will be equivalent because they carry the same charge

Answer:

  no

Explanation:

Faisal will finish the race in ...

  (72 m)/(6 m/s) = 12 s

In order to beat Faisal, Edward's average speed in those 12 seconds must exceed ...

  (100 m)/(12 s) = 8 1/3 m/s

To achieve that average speed, Edward's acceleration must be ...

  (8 1/3 m/s -6 m/s)/(12 s/2) = 7/18 m/s² ≈ 0.3889 m/s²

Accelerating at only 0.2 m/s², Edward will not beat Faisal.

_____

Additional comment

When acceleration is uniform, the average speed is reached halfway through the period of acceleration.

Answer:

o.o7m bb

Explanation:

Answer:

3000 m/s

Explanation:

We can use the equation velocity of a wave equals wavelength times  frequency.  Therefore, v = wavelength*f = (10 m)(300 Hz) = 3000 m/s

I hope this helps! :)

Answer:

The displacement of the train in this time period is 2,616.86 m.

Explanation:

A Uniformly Varied Rectilinear Motion is Rectilinear because the mobile moves in a straight line, Uniformly because of there is a magnitude that remains constant (in this case the acceleration) and Varied because the speed varies, the final speed being different from the initial one.

In other words, a motion is uniformly varied rectilinear when the trajectory of the mobile is a straight line and its speed varies the same amount in each unit of time (the speed is constant and the acceleration is variable).

An independent equation of useful time in this type of movement is:

[tex]vf^{2} =vi^{2} +2*a*d[/tex] Expression A

where:

The equation of velocity as a function of time in this type of movement is:

vf=vi + a*t

So the velocity can be calculated as: [tex]a=\frac{vf-vi}{t}[/tex]

In this case:

Replacing in the definition of acceleration:  [tex]a=\frac{42.4 m/s-27.5 m/s}{75 s}[/tex]

a=0.199 m/s²

Now, replacing in expression A:

[tex](42.4 m/s)^{2} =(27.5 m/s)^{2} +2*(0.199 m/s^{2}) *d[/tex]

Solving:

[tex]d= \frac{(42.4 m/s)^{2} - (27.5 m/s)^{2} }{2*(0.199 m/s^{2}) }[/tex]

d= 2,616.86 m

The displacement of the train in this time period is 2,616.86 m.

Answer:

See the explanation below

Explanation:

No matter at what height a body is dropped, the body will always accelerate to the same reason, which corresponds to Earth's gravitational acceleration.

g = 9.81 [m/s²]

That is, in the first second the velocity is 9.81 [m/s] = 9.81 [m/s²] x 1 [s]

Now in the second 2; 19.62 [m/s²] = 9.81 [m/s²] x 2 [s]

And in the third second 29.43 [m/s²] = 9.81 [m/s²] x 3 [s]

And etc.

Answer:

an increase in the angular speed due to the conservation of angular momentum principle.

Explanation:

From this question, this student has his arms outstretched and he is standing on a platform which is rotating with a constant angular speed.

When his arms are stretched, his moment of inertia I is increased.

Now as This student pulls his arms inwards, His moment of inertia I is going to decrease

Therefore, through the use of the conservation of angular momentum,

there would be an increase in angular speed.

The frequency of the  wave = 400/s

Given

v=200 m/s

λ=0.5 m

Required

The frequency of the  wave

Solution

Frequency (f): number of waves in one second

The frequency is inversely proportional to the wavelength

[tex]\tt f=\dfrac{v}{\lambda}\\\\f=\dfrac{200~m/s}{0.5~m}\\\\f=400/s[/tex]

Answer:

It is a force in the direction of the motion that allows the box to move

Explanation:

Answer:

sine the resistors are connected in series, we could add the sum and that single value replaces the individual resistors in series. therefore, 100ohm resistor can do.

Answer:

b.

Explanation:

Answer:4

Explanation:

The clips are not affected by magnet strength

Answer:

what's the question

........

Answer:

The phases of the moon are determined by its position in its orbit around the Earth and the Sun. The phases occur because, as the moon orbits the Earth, we see values on the side of the moon illuminated by the sun.

hope it helps!

The phases of the moon are determined by its position in its orbit around the Earth and the Sun. The phases occur because, as the moon orbits the Earth, we see values on the side of the moon illuminated by the sun.

This is due to the fact that the moon is actually only partially lighted, having already reached its full brilliance.

The moon will be in the "Third quarter" phase if it is highest in the sky at sunrise.

This is due to the fact that the moon will rise at this position at midnight, reaching its maximum peak just before daybreak. This is because the moon is lighted more than its half illumination even though it is moving toward becoming the new moon at this position.

The phases of the moon are determined by its position in its orbit around the Earth and the Sun. The phases occur because, as the moon orbits the Earth, we see values on the side of the moon illuminated by the sun.

To learn more about moon illumination refer to the link:

brainly.com/question/20160684

#SPJ2

Answer:

he wavelength is different (greater) than the wavelength of the incident photon

Explanation:

The Compton effect is the scattering of a photon by an electron, this process is analyzed using the conservation of momentum, in which we assume that initially the electron is at rest and after the collision it recedes, therefore the energy of the incident photon decreases and consequently its wavelength changes

To complete the sentence we use the wavelength is different (greater) than the wavelength of the incident photon

Answer:

In the formula, F = m×a, where a represents acceleration.

Answer:

Force=mass times acceleration

Explanation:

Answer:

Conservation of momentum

Explanation:

Out of the two options given, the more appropriate one is the law of conservation of momentum. This is particularly so because momentum deals with the velocity or speed of the car while considering its mass. So, if a large car is to collide with another car, small one, then the momentum is what is considered. Energy on the other hand is talking about the work that is done, while the momentum considers the mass of the car while it is moving and considering its speed also

Answer:

the correct answer is c, they will accelerate away from each other at different speeds. the 80kg will go faster due to less mass

Answer:

Gamma-rays have the smallest wavelengths and the most energy of any other wave in the electromagnetic spectrum. These waves are generated by radioactive atoms and in nuclear explosions.

Explanation:

Gamma-rays can kill living cells, a fact which medicine uses to its advantage, using gamma-rays to kill cancerous cells.

Hope this helps!

Brain-LIst?

Answer:

[tex]y = 4.36[/tex]

Explanation:

Let the height of the ladder be L

[tex]L = 10[/tex]

Also:

When the ladder leans against the wall, it forms a triangle and the length of the ladder forms the hypotenuse.

So, we have:

[tex]L^2 = x^2 + y^2[/tex] --- Pythagoras Theorem

When the base is 9ft from the wall, this means that:

[tex]x = 9[/tex]

Substitute 9 for x and 10 for L in [tex]L^2 = x^2 + y^2[/tex]

[tex]10^2 = 9^2 + y^2[/tex]

[tex]100 = 81 + y^2[/tex]

Make [tex]y^2[/tex] the subject

[tex]y^2 = 100 - 81[/tex]

[tex]y^2 = 19[/tex]

Make y the subject

[tex]y = \sqrt{19[/tex]

[tex]y = 4.36[/tex]

Hence, the true distance at that point is approximately 4.36ft

The true statement about the true distance between the top of the ladder and the ground when the base is 9 feets from the wall is - 9/√19

Let :

Ladder forms a right angle triangle as it leans against the wall :

Hence, we have :

Taking the implicit derivative of both sides:

2xdx/dt + 2ydy/dt = 0

xdx/dt + ydy/dt = 0

ydy/dt = - xdx/dt

dy/dt = (-xdx/dt) / y

When the ladder is 9 ft from the wall;

81 + y² = 100

y² = 100 - 81 = 19

y = √19

Substituting into the equation :

dy/dt = -9(1)/√19

Hence, dy/dt = - 9/√19

Learn more : https://brainly.com/question/13511183

Answer:

Explanation:

Wind is air in motion. It is produced by the uneven heating of the earth's surface by the sun. Since the earth's surface is made of various land and water formations, it absorbs the sun's radiation unevenly. Two factors are necessary to specify wind: speed and direction.

Answer:

I was also going to ask same question edited:ok i found its true

Answer:

400 Hz

Explanation:

The frequency of a sound wave is found by the velocity/wavelength.  Therefore, f = v/wavelength = (200 m/s)/(0.5 m) = 400 Hz

I hope this helps! :)

Answer:

Explanation:

The magnitude of the force on the box can be found by using the formula

[tex]f = \frac{w}{d} \\ [/tex]

w is the workdone

d is the distance

From the question we have

[tex]f = \frac{80}{8} \\ [/tex]

We have the final answer as

Hope this helps you

Answer:

10

Explanation:

80 divided 8 =10