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Dmitrij [34]
1 year ago
15

21. Explain why a passenger who is not wearing a safety belt will likely hit the windshield in a head-on collision. please answe

r in full sentences​
Physics
1 answer:
Marrrta [24]1 year ago
6 0
Because of inertia (Newton's First Law), the person will keep moving forward with the same velocity that they were travelling before the collision. Also, following Darwin's Law of natural selection, it is a mechanism for removing undesirable traits (idiocy) from the human gene pool.
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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
A car is traveling at a constant velocity of 20 m/s for 45 seconds. How far does the car go?
n200080 [17]

Answer: My bad bro. Just tryna get me some points g

Explanation: tuff

3 0
3 years ago
Read 2 more answers
Wood is an example of a translucent material.<br> True<br> False
Svetradugi [14.3K]
False, wood is a solid structure that is not see through
3 0
3 years ago
Explain why a description of motion has to be in reference to something else. ( I don't know if this is physics, it's science )
timurjin [86]
Description of motion has to refer to the change in distance over a certain amount of time, or balanced forces
8 0
3 years ago
Two skaters collide and grab on to each other on frictionless ice. One of them, of mass 66.0 kg , is moving to the right at 2.00
ivann1987 [24]

Answer:

The velocity of skaters after collision is 0.55 m/s and they are moving to the left

Explanation:

Consider m₁ and m₂ are the masses of two skaters and their initial velocity be v₁ and v₂ respectively.

Consider the velocity along right direction as positive while negative for left direction.

According to the problem,

Mass of first skater, m₁ = 66.0 kg

Mass of second skater, m₂ = 75.0 kg

Velocity of first skater, v₁ = + 2.00 m/s

Velocity of second skater, v₂ = -2.80 m/s

Since, the two skaters grab each other after collision. Hence, they are moving with same final velocity v.

Applying conservation of linear momentum,

Momentum before collision = Momentum after collision

m₁v₁ + m₂v₂ = (m₁+m₂)v

Substitute the suitable values in the above equation.

66 x 2 - 75 x 2.8 = (66 + 75 )v

v= \frac{-78}{141}

v = -0.55 m/s

The negative sign denotes that both the skaters are moving in the left direction.

6 0
4 years ago
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