Why is understanding the concept of forces, friction and gravity important?

Physics

1 answer:

nydimaria [60]4 years ago

8 0

Because it's the basis of how everything around you works

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A sheet of aluminum (al) foil has a total area of 1.000 ft2 and a mass of 3.716 g. what is the thickness of the foil in millimet

Andrews [41]

The mass of the sheet of aluminium is the product between its density d and its volume V:
$m=dV$
Re-arranging the equation, we can find the volume of the sheet:
$V= \frac{m}{d}= \frac{3.716 g}{2.699 g/cm^3}= 1.377 cm^3$

Converted in millimeters,
$V=1377 mm^3$

The area is
$A=1.00 ft^2$
Since $1 ft = 0.305 m$ , this area corresponds to
$A=1.00 ft^2 = (0.305 m)^2 = 0.093 m^2 = 0.093 \cdot 10^6 mm^2$

So we can now find the thickness of the sheet of aluminium:
$t= \frac{V}{A}= \frac{1377 mm^2}{0.093 \cdot 10^6 mm^2}=0.015 mm$

3 0

3 years ago

An 82 g arrow is fired from a bow whose string exerts an average force of 95 n on the arrow over a distance of 77 cm. what is th

Zigmanuir [339]

You need to find speed, v.
And you (should) recognize the famous F=ma.

We've got data for F and m, so we can find a first!
$a = \frac{f}{m}$
a = 95N / 0.082 kg

Now from a we nees to find v. But how is v and a related?
$a = v \times \frac{dv}{dx}$
where dv is the change in speed (some unknown v minus zero since arrow is initially at rest). dx is the distance where the arrow experiences a force (77 cm!).

Now you know values for a, dv, and dx... you can plug those in and find v!

5 0

3 years ago

A 50 kg boy running with a velocity of 6 m/s passes by a 2000 kg truck at rest. Which one has greater momentum, the truck or the

Assoli18 [71]

Answer:

The boy has a greater momentum

Explanation:

The reason why the boy has a greater momentum is because the truck is at rest so it isn’t moving and momentum has to do with the quantity of motion

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3 years ago

HELP PLZ I will give you 10 points

svet-max [94.6K]