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3 years ago

Explain in detail , four physical properties of metals

Physics

1 answer:

astraxan [27]3 years ago

3 0

Answer:

Explanation:

Physical properties are usually those that can be observed using our senses such as color, luster, freezing point, boiling point, melting point, density, hardness and odor. Metalloids have mixed properties which are difficult to characterize. Conductivity: Semi-conductive.

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A package is dropped from the height of 100 m and falls freely. How fast will the package be traveling when it hits the ground?

ki77a [65]

Answer:

<em>The package will be traveling at 44.3 m/s when it hits the ground</em>

Explanation:

<u>Free Fall Motion</u>

A free-falling object falls under the sole influence of gravity. Any object that is being acted upon only by the force of gravity is said to be in a state of free fall. Free-falling objects do not encounter air resistance.

If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is $g = 9.8 m/s^2$ .

The final velocity of a free-falling object after a time t is given by:

vf=g.t

The distance traveled by a dropped object is:

$\displaystyle y=\frac{gt^2}{2}$

If we know the height h from which the object was dropped, we can find the time it takes fo hit the ground:

$\displaystyle t=\sqrt{\frac{2h}{g}}$

The package was dropped from h=100 m, thus the time taken to reach the ground is:

$\displaystyle t=\sqrt{\frac{2(100)}{9.8}}$

$t = 4.52~s$

The final speed is now calculated:

$vf=9.8*4.52$

$vf=44.3~m/s$

The package will be traveling at 44.3 m/s when it hits the ground

7 0

3 years ago

How might scientists study something that they cannot observe directly?

yarga [219]

Answer:

The sun

Explanation:

if they get too close even the heat that radiates of of it would burn you or give sunburn bad and the sun is a shining ball of energy it is way to hot for a human to get close

8 0

3 years ago

Coming to the bottom of a mountain, a skier moving with speed v collides with a barrier and is brought to a stop in an amount of

IRISSAK [1]

Answer:

Explanation:

Impulse of a force is measured by force x time or F X t

Impulse also equals change in momentum or

F x t = m v₂ - m v₁

The given case is as follows

in the first case

F x t = mv - o = mv

F = mv / t

in the second case

F₁ x 4 t = mv

F₁ = 1/4 x mv /t

F₁ = F / 4

option a) is correct .

iii )

In the last case

F₂ X t = m v/2 -0

F₂ = 1/2 x mv / t

= 1/2 x F

F₂ = F/2

Option e ) is correct.

8 0

3 years ago

1. In 10 seconds, a car accelerates 4 m/s/s to 60 m/s. How fast was the car going before it accelerated?

ladessa [460]

4m/s is the answer you are looking for

3 0

3 years ago

Can someone help me please

Vedmedyk [2.9K]

The correct answer would be

Mile

3 0

3 years ago

Explain in detail , four physical properties of metals​

Explain in detail , four physical properties of metals