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3 years ago

Define Inertia with an example

Physics

2 answers:

DochEvi [55]3 years ago

7 0

Answer:

Inertia resists change in motion. Objects want to stay in rest or motion unless an outside force causes a change. For example, if you roll a ball, it will continue rolling unless friction or something else stops it by force.

EXAMPLE: when you shake a branch the leaves get detached.

Explanation:

slamgirl [31]3 years ago

7 0

$\pmb{\large{inertia} }$

Inertia is basically 3 types

Inertia of rest.

When the resistance is offered by the body to continue in the state of rest unless an external force acts on it.

Inertia of direction. 

When the resistance is offered by the body to continue the motion in the same direction unless an external force acts on it.

Inertia of motion. 

When the resistance is offered by the body to continue to be in the uniform motion unless an external force acts on it.

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4 years ago

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4 years ago

How fast would 0.145 kg baseball have to go to have a kinetic energy of 88.7 J?

Sergeu [11.5K]

Answer:

Correct answer: v = 34.98 m/s

Explanation:

The kinetic energy formula is Ek = m v²/2 => v = √2Ek/m

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3 years ago

A man hits a ball and provides it with an initial velocity of 5.0 m/s on a rough horizontal surface. Due to the surface the ball

Alex777 [14]

Answer:

a) After 5.19 seconds dog catch the ball.

b) From the dog's initial position at 20.20 m dog catches the ball.

c) Speed of the ball when dog catches ball = 2.405 m/s

Speed of the dog when dog catches ball = 7.785 m/s

Explanation:

a) Let the time of catching be t.

We have equation of motion s = ut + 0.5 at²

Consider the motion of ball

Initial velocity, u = 5 m/s

Acceleration, a = -0.5 m/s²

Time, t = t

Substituting

s = 5 x t + 0.5 x -0.5 x t²

s = 5t - 0.25t²

Consider the motion of dog

Initial velocity, u = 0 m/s

Acceleration, a = 1.5 m/s²

Time, t = t

Substituting

s + 1 = 0 x t + 0.5 x 1.5 x t²

s = 0.75t²

If they catch up displacement of dog is 1 m more than displacement of ball.

That is

5t - 0.25t² + 1 = 0.75t²

t² - 5t -1 = 0

t = 5.19 or t = -0.19(not possible)

So after 5.19 seconds dog catch the ball.

b) Displacement of dog, s = 0.75t²

s = 0.75 x 5.19²

s = 20.20 m

From the dog's initial position at 20.20 m dog catches the ball.

c) We have equation of motion v = u + at

Consider the motion of ball

Initial velocity, u = 5 m/s

Acceleration, a = -0.5 m/s²

Time, t = 5.19 s

Substituting

v = 5 + -0.5 x 5.19 = 2.405 m/s

Speed of the ball when dog catches = 2.405 m/s

Consider the motion of dog

Initial velocity, u = 0 m/s

Acceleration, a = 1.5 m/s²

Time, t = 5.19 s

Substituting

v = 0 + 1.5 x 5.19 = 7.785 m/s

Speed of the dog when dog catches ball = 7.785 m/s

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3 years ago

Which of the following describes the oscillation of the medium in transverse waves?

svp [43]

Wave An oscillation that transfers energy and momentum.

Mechanical wave A disturbance of matter that travels along a medium. Examples include waves on a string, sound, and water waves.

Wave speed Speed at which the wave disturbance moves. Depends only on the properties of the medium. Also called the propagation speed.

Transverse wave Oscillations where particles are displaced perpendicular to the wave direction.

Longitudinal wave Oscillations where particles are displaced parallel to the wave direction.

In a transverse wave, perpendicular to the direction the wave travels, the particles are displaced. Examples of transverse waves include on a string vibrations and on the water surface ripples. By moving the slinky up and down vertically, we can create a horizontal transverse wave.

In a longitudinal wave, parallel to the direction the wave travels, the particles are displaced. Compressions that move along a slinky are an example of longitudinal waves. By pushing and pulling the slinky horizontally, we can make a horizontal longitudinal wave.

Common mistakes and misconceptions

Sometimes people forget that wave velocity is not the same as the velocity of the medium particles. How fast the disturbance travels through a medium is the wave speed. The velocity of the particle is how fast a particle moves about its position of equilibrium.

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3 years ago

Define Inertia with an example​

Define Inertia with an example