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4 years ago

The thrust from a car is 590 N. The air resistance and friction together total 680 N. What happens to the speed of the car?

1 answer:

5 0

The net force in the direction the car is traveling (forward) is

(590 - 680) = -90N = 90 newtons backwards.

The car accelerates backwards at the rate of (90/its mass) m/sec-squared.

Another way to look at it: The car's forward speed decreases at that rate.

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WILL MARK BRAINLIEST !!!

Tresset [83]

Answer:

P waves are a type of seismic wave that is characterized by being a longitudinal mechanical wave, which means that the medium through which they travel is alternately compressed and dilated in the same direction of propagation. This means they propagate in a similar way to the sound.

These waves are faster than the S waves, so when an earthquake occurs these waves are the first to be recorded by the seismograph. They can also travel through any type of material (solid, liquid or gaseous), this means they are able to travel through solid rocks as well as in oceans or volcanic magma and are even able to be transmitted through the atmosphere, that is why they are sometimes perceived by people and animals as a deep sound.

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3 years ago

The rectangular coils in a 345-turn generator are 12 cm by 12 cm. Part A

Likurg_2 [28]

Answer:

118.166 volt

Explanation:

We have given number of turns N =345

Sides of the rectangular coils is 12 cm =0.12 m

So area A =0.12×0.12=0.0144 $m^2$

Magnetic field B =0.45 T

Angular speed =505 rpm

Speed in rad/sec $\omega =\frac{2\pi N}{60}=\frac{2\times 3.14\times 505}{60}=52.8566rad/sec$

The emf is given by $E=NAB\omega SIN\omega t$

For maximum emf sinwt =1

So $E=345\times 0.0144\times 0.45\times 52.8566=118.166volt$

4 0

3 years ago

Is kevin Showing work help him please

7nadin3 [17]

Answer:

I believe it is not a chemical change for the components are not changing.

This excerpt from thoughtco.com states that for it to be a chemical change, the atoms would be rearranged.

In other words, a chemical change is a chemical reaction involving the rearrangement of atoms. While a physical change can often be reversed, a chemically change typically cannot be, except through more chemical reactions. When a chemical change occurs, there is also a change in the energy of the system.

So, in this case, they are not being rearranged, just combined to form one big fruit salad.

4 0

3 years ago

A flywheel flows from 250rpm to 150rpm in 4.2 seconds. How many revolutions occur during this time

Assoli18 [71]

Answer:

7revolutions

Explanation:

Given parameters:

Initial revolution = 250rpm

Final revolution = 150rpm

Time = 4.2s

Unknown:

Number of revolutions that occur at this time = ?

Solution:

To solve this problem;

let us find the change in revolution = 250rpm - 150rpm = 100rpm

Convert the time to seconds;

60s makes 1 minute

4.2s will make $\frac{4.2}{60}$ = 0.07min

So;

The number of revolutions at this time = 100rpm x 0.07min

= 7revolutions

6 0

3 years ago

Graphing data is most used to help you to observe_____ *

kotykmax [81]

Answer: Graphing data is used to display data because it is easier to see trends in the data when it is displayed visually compared to when it is displayed numerically in a table.

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3 years ago