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Nataly [62]
3 years ago
8

(20 points) Pressure is a measure of force per unit area or P=F/A. A student is checking the amount of pressure their car exerts

upon the road. The car weighs 2.25 tons ( US short ton ). The student finds the dimensions of each tire's footprint on the road is 12.5 cm X 16.5 cm. In pounds per square inch (psi), what is the total pressure the car exerts upon the road?
Physics
1 answer:
Gala2k [10]3 years ago
6 0

Answer:

35.2 ps

Explanation:

Hello!

A US short ton is equal to 2 000 pounds, therefore:

2.25 tons = 4500 pounds

Now lets convert the area of each tire footprint:

1 cm = 0.393701 in

12.5 cm = 4.92126 in

16.5 cm = 6.49607 in

Therefore, the area of the footprint is:   31.9688 in^2

Then, the pressure exerted by the car is given by the weigth devided by the total area, that is 4 times the area of the footprint :

4500 /(4 * 31.9688)  psi = 35.1906 psi

Rounding to the first tenth

35.2 psi

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3 years ago
Sarah's mother gets a flat tire on her car while driving Sarah to school. They use a jack to change the tire. It exerts a force
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Answer:

1250 J

Explanation:

Work is said to be done when a force causes an object to move over a distance. The amount of work done (W) is calculated by multiplying the force by the distance traveled.

That is;

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Where;

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W = F × d

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Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, t
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t=0.038s

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Time t

Solution

From Newtons second law we know that

∑F=ma

Where m is mass

a is acceleration

We can write this equation as

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Rearrange this equation to find time t

So

t=m\frac{v_{f}-v_{i}}{F}

Substitute the given values

t=3.8kg\frac{9.3*10^3m/s-0}{9.3*10^5N} \\t=0.038s  

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