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Anuta_ua [19.1K]

3 years ago

8

An iron nail goes through a chemical change when iron in the nail combines with oxygen in the air to form iron oxide. This compo

und forms with a chemical bond between the elements oxygen and iron. The chemical formula for iron oxide is: Fe2O3

1 answer:

Mazyrski [523]3 years ago

6 0

It is like that, except most nails are steel or stainless steel, slowing to rusting process to about 5 years.

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The acceleration of the object may be zero and the velocity of the object may not be equal to zero correct or not

Zinaida [17]

Answer:

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What holds the moon in place, orbiting around earth?

pshichka [43]

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Gravity

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A sound travels down a hallway that is 115 m long. Then it echoes and

yan [13]

Answer:

0.66 s

Explanation:

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2 years ago

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3 years ago

a baseball is hit 3 feet above ground level at 100 feet per second and at an angle of 45 with respect to the ground. (g=32 feet/

LiRa [457]

Answer:

hmax=81ft

Explanation:

Maximum height of the object is the highest vertical position along its trajectory.

The vertical velocity is equal to 0 (Vy = 0)

$0=V_{y}-g*t=v_{0}*sin(\alpha)-g*th\\$

we isolate th (needed to reach the maximum height hmax)

$th = \frac{v_{0}*sin(\alpha)}{g}$

The formula describing vertical distance is:

$y = Vy * t-g* t^{2} / 2$

So, given y = hmax and t = th, we can join those two equations together:

$hmax = Vy* th-g*th^{2}/2$

$hmax =Vo^{2}*sin(\alpha )^{2}/(2*g)$

if we launch a projectile from some initial height h all you need to do is add this initial elevation

$hmax =h+Vo^{2}*sin(\alpha)^{2}/(2*g)$

$hmax =3+100^{2}*sin(45)^{2}/(2 * 32)=81 ft$

6 0

3 years ago