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3 years ago

The external cover of aeroplane is made up of aluminium instead of iron. Why?

Physics

2 answers:

____ [38]3 years ago

8 0

Aluminium is lighter than Iron, Iron is 26 on the periodic table while Aluminium is 13, half of the weight.

Vlada [557]3 years ago

3 0

The same volume of aluminum has a smaller mass than iron and aircrafts better be light.

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One strategy in a snowball fight is to throw

blondinia [14]

Answer:

Range formula: R = v^2 sin (2 theta) / g

If theta = 69 deg and v = 15.1

R = 15.1^2 sin 138 / 9,8 = 15.6 m

sin 138 = .669 = sin 42

So a snowball thrown at 21 deg will travel

R = 15.1 * .669^2 / 9.8 = 15.6 m

The second snowball can be thrown at 21 deg to travel the same distance

Vx = V cos theta = 15.1 * cos 69 = 5.41 first snowball

t1 = 15.6 / 5.41 = 2.88 sec

Vx = V cos theta = 15.1 cos 21 = 14.1 m/s

t2 = 15.6 / 14.1 = 1.11 sec

Difference = t1 - t2 = 1.77 sec time delay for second snowball

7 0

3 years ago

What element is in group 1 peroid 6

Ahat [919]

Answer:

Group 1: Hydrogen is a gas and every other element in the group is a solid at room temperature. Period 6: They are all solids except for Radon and Mercury.

Explanation:

6 0

2 years ago

What is the effect on the force of gravity between two objects if the mass of one object remains unchanged while the distance to

drek231 [11]

Answer:

The force of gravity after you double the mass and the distance is half of the initial force: $F_{2}=\frac{1}{2}F_{1}$

Explanation:

The initial force of gravity is:

$F_{1}=\frac{Gm_{1}m_{2}}{r^2}$

where $G$ is the universal gravitational constant, $m_{1}$ is the mass of the first object, $m_{2}$ is the mass of the second object, and $r$ is the distance between the objects.

If the mass of the second object is doubled, now we have $2m_{2}$ , and if the distance between the objects is also doubled instead of $r$ now we have $2r$ .

So the force of gravity now is:

$F_{2}=\frac{Gm_{1}(2m_{2})}{(2r)^2}\\ F_{2}=\frac{2Gm_{1}m_{2}}{4r^2} \\F_{2}=\frac{1}{2} \frac{Gm_{1}m_{2}}{r^2}$

and we know that $F_{1}=\frac{Gm_{1}m_{2}}{r^2}$

so the new force of gravity is:

$F_{2}=\frac{1}{2}F_{1}$

The force of gravity after you double the mass and the distance is half of the initial force.

3 0

3 years ago

Which organelle is unique to plants and captures light energy for photosynthesis?

evablogger [386]

<h2>Explanation:</h2>

<h3>B. Chloroplast</h3>

In photosynthesis chloroplast inside the leaf contain chlorophyll which captures light energy for photosynthesis.

hope this helps you

have a good day.

5 0

2 years ago

Read 2 more answers

An object of mass 82kg is accelerated upward at 3.2m/s/s. what force is required

vampirchik [111]

F = m · a

In order to accelerate 82 kg upward at the rate of 3.2 m/s², a NET upward force of (82kg · 3.2m/s²) = 262.4 Newtons is required.

But if the object is on or near the surface of the Earth, then there's a downward force of (82kg · 9.8m/s²) = 803.6 N already acting on it because of gravity.

So you need to apply (803.6N + 262.4N) = 1,066 Newtons UPward, in order to cancel its own weight and accelerate it upward at that rate.

6 0

3 years ago