PLEASE HELP ME SOMEONE

A car initially traveling at 27.7 m/s undergoes a constant negative acceleration of magnitude 2.00 m/s2 after its brakes are app

lys-0071 [83]

The car's velocity at time t is given by

$v=27.7\dfrac{\rm m}{\rm s}+\left(-2.00\dfrac{\rm m}{\mathrm s^2}\right)t$

It comes to a stop when v = 0, which happens when

$0=27.7\dfrac{\rm m}{\rm s}+\left(-2.00\dfrac{\rm m}{\mathrm s^2}\right)t\implies t=13.85\,\mathrm s$

or after about 13.9 s.

In this time, the car travels a distance x given by

$x=\left(27.7\dfrac{\rm m}{\mathrm s}\right)(13.85\,\mathrm s)+\dfrac12\left(-2.00\dfrac{\rm m}{\mathrm s^2}\right)(13.85\,\mathrm s)^2=191.823\,\mathrm m$

or about 192 m.

In one complete revolution, each tire covers a distance equal to its circumference,

$2\pi(0.340\,\mathrm m)\approx2.13628\,\mathrm m$

or about 2.14 m.

This means each tire will complete approximately 192/2.14 ≈ 90 revolutions.

8 0

3 years ago

A centripetal force of <img src="https://tex.z-dn.net/?f=F_c" id="TexFormula1" title="F_c" alt="F_c" align="absmiddle" class="la

Minchanka [31]

Answer:

The centripetal on the car will become 4 times when the velocity gets twice.

Explanation:

As we know that centripetal force on the car of mass m and moving with constant speed v given as

$F_c=\dfrac{mv^2}{r}$

m=mass

v=velocity

r=radius of the circular arc

We are assuming that the mass of the both the car is same.

If the velocity of the car gets twice 2 v

The new centripetal force on the car

$F_c'=\dfrac{m(2v)^2}{r}$

$F_c'=4\dfrac{mv^2}{r}$

$F_c'=4\ F_c$

Therefore we can say that centripetal on the car will become 4 times when the velocity gets twice.

3 0

3 years ago

A wave has a frequency of 5 HZ and a speed of 25 m/s. what is the wavelength of a wave?

svp [43]

Wave speed = frequency * wavelength

We need to rearrange this equation because we are finding the wavelength :

Wavelength = wave speed / frequency

To rearrange it, I just divided it by frequency so that wavelength was the subject.

Now, input these numbers into this equation :
Wavelength = wave speed / frequency
Wavelength = 25 / 5
Wavelength = 5m

5 0

3 years ago

Read 2 more answers

Please help me with this question

Andrei [34K]

Answer:

C

Explanation:

Ore is usually refined once digged out to make certain things

6 0

4 years ago

How does the gravitational force exerted on earth by the sun with that exerted by the moon

kaheart [24]

The gravitational forces between the sun and the Earth
are about 176 times stronger than the gravitational forces
between the moon and the Earth.

For the calculation, see the answer to the other time you
posted this question.

Wow ! What does that say about the tides ?
I'm not sure just now.

6 0

4 years ago