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3 years ago

Which of the following is a result of the transfer of energy?

2 answers:

7 0

OPTION C) MAGNETISM IS THE RIGHT ANSWER....

Explanation:

MAGNETISM IS TRANSFER THE ENERGYS. BECAUSE IN THE CHOOSE IT OTHER OPTION ARE NOT HAVE ANY ENERGY. SO MAGNETISM IS THE RIGHT ANSWER....

HOPE IT HELP.....✌✌✌

Lostsunrise [7]3 years ago

3 0

Answer: Sound

Explanation: it's asking which of the following is a result of transfer of energy and sound comes from vibrations

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After the box comes to rest at position x1, a person starts pushing the box, giving it a speed v1. When the box reaches position

SVETLANKA909090 [29]

Answer:

$w_p = \frac{1}{2}mv_1^2+\frac{1mv_0^2}{2x_1}(x_1-x_2)$

Explanation:

First, the box goes from position x=0 to x=x1, so, the work made by the friction is calculated as:

$-F_f(x_1) = \frac{1}{2}mV^2 -\frac{1}{2}mv_0^2$

where $F_f$ is the force of friction, $x_1$ the displacement, m the mass, V is the speed in rest and $v_0$ the initial speed.

V is equal to zero, so:

$F_f(x_1)=\frac{1}{2}mv_0^2$

it means that the force of friction $F_f$ is equal to:

$F_f = \frac{1mv_0^2}{2x_1}$

On the other hand, when the box goes from position x=x1 to x=x2, the work-energy theorem said that:

$-F_f(x_1-x_2)+w_p = \frac{1}{2}mv_1^2-\frac{1}{2}mV^2$

Where $w_p$ is the work done by the person.

Then, solving for $w_p$ :

$-F_f(x_1-x_2)+w_p = \frac{1}{2}mv_1^2$

$w_p = \frac{1}{2}mv_1^2+F_f(x_1-x_2)$

Finally, replacing $F_f$ by $\frac{1mv_0^2}{2x_1}$ , we get:

$w_p = \frac{1}{2}mv_1^2+\frac{1mv_0^2}{2x_1}(x_1-x_2)$

6 0

3 years ago

A 4.5 kg box slides down a 4.3-m-high frictionless hill, starting from rest, across a 2.0-m-wide horizontal surface, then hits a

Rainbow [258]

Answer:

speed before reaching rough surface = 9.18 m/s

speed before hitting spring = 8.70 m/s

spring compression = 82 cm

number of complete trip = 9

Explanation:

Lets say

Position 1: On top of hill

Position 2: down the hill

Position 3: after the rough surface

Position 4: after hitting the spring

We'll strictly use conservation of energy for this equation

Potential energy on top of energy is full converted into kinetic energy down the hill (since surface is frictionless)

Hence, PEg1 = KE2

mgh = (1/2)mv2^2

(4.5)(9.8)(4.3) = (1/2)(4.5)v2^2

189.63 = (1/2)(4.5)v2^2

v2^2 = 2(9.8)(4.3) = 84.28

v2 = sqrt(84.28) = 9.18 m/s

After down the hill, it passes a rough surface. So some of the energy is loss due to friction forces

Friction force, Ff = u (coeff of kinetic friction ) x N (normal force)

Normal force, N = weight of box = mg = 4.5 x 9.8

Ff = 0.22 x 4.5 x 9.8

Work done / Energy loss = Wf = Ff x d (distance)

Wf = 0.22 x 4.5 x 9.8 x 2 = 19.404

Energy after passing the rough surface is totally kinetic energy

KE3 = KE2 - Wf = 189.63 - 19.404 = 170.226

speed after rough surface,

(1/2)mv3^2 = 170.226

v3 = sqrt((2 x 170.226)/4.5) = 8.70 m/s

After hitting the spring, all the kinetic energy is converted into potential energy of spring

170.226 = (1/2)kx^2

x^2 = 2 x 170.226 / 510 {note that constant of spring, k = 510}

x^2 = 0.668

x = sqrt(0.668) = 0.82m (82 cm)

To calculate complete trip before the box coming to rest, note that the only place where it loss energy is at the rough surface.

Energy before the first time pass rough surface = 189.63

Energy loss each time passing rough surface = 19.404

189.63 / 19.404 = 9.773 (9 complete with balance of 0.773)

That mean, the box will pass the rough surface 9 complete trip before coming to rest

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3 years ago

Describe how does the temperature relate to density and the movement of atmospheric gases? A) As the air warms expanding its vol

cluponka [151]

The correct answer is A) As the air warms expanding its volume, decreasing its density, and the air molecules rise

The air molecules speed up and spread. If the container is closed then it may pop because the air expands. Hot air goes up and cold air goes down.

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2 years ago

A cyclist rides at a constant speed of 4. 5 m/s around a curve. If the centripetal acceleration is 29 m/s2, what is the radius o

QveST [7]

Answer:

a = v^2 / R = 4.5^2 / R = 29

R = 4.5^2 / 29 = .70 m

3 0

1 year ago

Form of communication that reaches large audiences without personal contact.

lukranit [14]

Socialization is the process of internalization of the norms and ideologies of society by an individual. It encompasses learning and teaching to attain social and cultural continuity. It also has various forms. One of which is the MASS MEDIUM/MEDIA which is a form of communication that does not need personal contact to relay or convey and information. Examples of which are books, films, internet, magazines and so forth.

4 0

3 years ago

Read 2 more answers

Which of the following is a result of the transfer of energy￼?

Which of the following is a result of the transfer of energy?