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3 years ago

How do seatbelts reduce injury during a collision ?

1 answer:

3 0

Among drivers and front-seat passengers, seat belts reduce the risk of death by 45%, and cut the risk of serious injury by 50%. Seat belts prevent drivers and passengers from being ejected during a crash. People not wearing a seat belt are 30 times more likely to be ejected from a vehicle during a crash.

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When you drop a 0.43 kg apple, Earth exerts

N76 [4]

The magnitude of the Earth's acceleration is $7.0\cdot 10^{-25} m/s^2$

Explanation:

First of all, we start by calculating the magnitude of the force exerted by the apple on the Earth. According to Newton's third law, this is equal to the force exerted by the Earth on the apple, which is the weight of the apple, given by:

$F=mg$

where

m = 0.43 kg is the mass of the apple

$g=9.8 m/s^2$ is the acceleration of gravity

Substituting,

$F=(0.43)(9.8)=4.2 N$

Now we can find the Earth's acceleration by applying Newton's second law:

$F=Ma$

where:

F = 4.2 N is the net force exerted by the apple on the Earth

$M=5.98\cdot 10^{24} kg$ is the mass of the Earth

a is the Earth's acceleration

And solving for a, we find:

$a=\frac{F}{M}=\frac{4.2}{5.98\cdot 10^{24}}=7.0\cdot 10^{-25} m/s^2$

Learn more about Newton laws of motion:

brainly.com/question/3820012

brainly.com/question/11411375

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8 0

4 years ago

With which field of science is Albert Einstein associated? biology chemistry medecine physics

sveta [45]

He was a theoretical physicist

3 0

3 years ago

Read 2 more answers

Velocity of a wave is the. (a) Wavelength x frequency (b) Wave number x frequency (c) Time period x phase (d) None

Elden [556K]

Answer:

option (a)

Explanation:

Wavelength is defined as the distance traveled by the wave in one complete oscillation.

The number of oscillations completed in one second is called frequency.

The relation for the wave velocity is given by

wave velocity = frequency x wavelength

4 0

3 years ago

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of which fun

gizmo_the_mogwai [7]

The formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of tangent, cosine and sine.

<h3>What is vertical motion of a projecile?</h3>

The vertical motion of a projectile is affected by gravity and the velocity of vertical motion given by the following formula;

Vy = Vsinθ

<h3>What is horizontal motion of a projecile?</h3>

The horizontal velocity of a projectile is given by the following formula;

Vx = Vcosθ

<h3>Direction of the motion</h3>

The direction of the motion is calculated as follows;

tanθ = Vy/Vx

Thus, the formulas used to analyze the horizontal and vertical motion of projectiles launched at an angle involve the use of tangent, cosine and sine.

Learn more about vertical motion here: brainly.com/question/24216590

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4 0

3 years ago

This is a type of friction experienced within liquids and gases. It depends on:__________.

Aleksandr-060686 [28]

Answer:

(1) how thick the fluid is <u>viscosity</u>

Explanation:

This is a type of friction experienced within liquids and gases. It depends on:__________.

(1) how thick the fluid is_______?

(2) how the shape of the object?

(3) how the speed of the object?

the thickness of a fluid is known as viscosity. the more viscous a fluid is the more frictional force is exerted on an object by the fluid

frictional force is an opposing force that resist the movement of two surfaces in contact, there are to types 0f frictional force

1. static frictional force

2. dynamic frictional force

4 0

3 years ago