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Natali5045456 [20]
3 years ago
12

A car travels from rest to 55 m/s in 10 seconds. What is its acceleration?

Physics
1 answer:
maria [59]3 years ago
5 0

Answer:

(55-0)/10 --> 55 m/s / 10 s --> 5.5 m/s^2

Explanation:

I WANT U TO PARK THAT BIG MACK TRUCK, RIGHT IN THIS LITTLE GRAGE

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Yes an object in motion has kinetic energy
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A motorcycle is travelling at a constant velocity of 30ms. The motor is in high gear and emits a hum of 700Hz. The speed of soun
timurjin [86]

Answer:

a) T=1.43\times 10^{-3}\ s

b) d=0.0429\ m

c) \lambda=0.4857\ m

d) f_o=767.7\ Hz

Explanation:

Given:

  • velocity of the sound from the source, S=340\ m.s^{-1}
  • original frequency of sound from the source, f_s=700\ Hz
  • speed of the source, v_s=30\ m.s^{-1}

(a)

We know time period is inverse of frequency:

Mathematically:

T=\frac{1}{f}

T=\frac{1}{700}

T=1.43\times 10^{-3}\ s

(b)

Distance travelled by the motorcycle during one period of sound oscillation:

d=v_s.T

d=30\times 1.43\times 10^{-3}

d=0.0429\ m

(c)

The distance travelled by the sound during the period of one oscillation is its wavelength.

\lambda=\frac{S}{f}

\lambda=\frac{340}{700}

\lambda=0.4857\ m

(d)

observer frequency with respect to a stationary observer:

<u>According to the Doppler's effect:</u>

\frac{f_o}{f_s}= \frac{S+v_o}{S-v_s} ...........................(1)

where:

f_o\ \&\ v_o are the observed frequency and the velocity of observer respectively.

Here, observer is stationary.

\therefore v_o=0\ m.s^{-1}

Now, putting values in eq. (1)

\frac{f_o}{700}= \frac{340+0}{340-30}

f_o=767.7\ Hz

5 0
3 years ago
22. (I) A car slows down from 28 m/s to rest in a distance of
lidiya [134]

Answer:

a = -8.912 m/s²

Explanation:

Given,

The initial velocity of the car, u = 28 m/s

The final velocity of the car, v = 0

The distance traveled by car, d = 88 m

The velocity displacement relation is given by the formula

                                          v = d/t

∴                                         t = d/v

Substituting in the above values in the given equation

                                           t = 88/28

                                            = 3.142 s

The acceleration is given by the formula

                                         a = (v-u)/t

                                            = (0 - 28)/3.142

                                            = -8.912 m/s²

The negative sign is that the car is decelerating.

Hence, acceleration a = -8.912 m/s²

7 0
3 years ago
How many carbon atoms are there in 5 molecules of CHCl3?
lukranit [14]

There are 5 carbon atoms present in the Chemical formula, CHCl_\\{3} .

<h3>What is a chemical formula?</h3>

A chemical formula is used to show the number and type of atoms present in a molecule, using the atomic symbols of the elements and numerical subscripts.

From the chemical formula;

We can deduce that we have the following elements and their corresponding number of atoms in one molecule of the compound;

Carbon = 1 atom

Hydrogen = 1 atom

Chlorine = 3 atoms

So, in 5 molecules of the compound;

Carbon = 1 x 5 = 5 atoms

Hydrogen = 1 x 5 = atoms

Chlorine = 3 x 5 atoms = 15 atoms

In conclusion, from the solution above, we can say that we have 5 atoms of carbon present in 5 molecules of CHCl_3.

Learn more about chemical formula:brainly.com/question/26388921

#SPJ1

5 0
1 year ago
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