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sukhopar [10]
4 years ago
13

PLEASE HELP ME SOMEONE

Physics
1 answer:
sasho [114]4 years ago
7 0
I think its B or D, most likely D.
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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 <em>t</em> 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 <em>v</em> = 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 <em>x</em> 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
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