1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Serjik [45]
2 years ago
15

Una barra de hierro cuya longitud inicial es de 2m se le incrementa su temperatura de 20 °C a 120 °C ¿Cuál es la longitud final

de la barra? (considera que el coeficiente de dilatación del hierro) es 1,2 x 10-5 1/°C ( 3 puntos)
Physics
1 answer:
Ksivusya [100]2 years ago
8 0

Answer:

1.9976 m

Explanation:

An iron bar whose initial length is 2m has its temperature increased from 20 ° C to 120 ° C. What is the final length of the bar? (consider that the coefficient of expansion of iron) is 1.2 x 10-5 1 / ° C (3 points)

Given that,

Initial length of an iron bar, L_0=2\ m

The temperature increased from 20°C to 120°C

The coefficient of expansion of iron is 1.2\times 10^{-5}\ /^{\circ} C

We need to find the final length of the bar.

The linear expansion equation is given by :

\Delta L=\alpha L\Delta T

Where \Delta L is the change in length

\Delta L=1.2\times 10^{-5}\times 2\times (120-20)\\\\=0.0024\ m

Also, \Delta L = L_o-L

L is final length

0.0024= 2-L\\\\L=2-0.0024\\\\=1.9976\ m

So, the final length of the bar is 1.9976 m

You might be interested in
Calculate the angle of refraction of 30.0° light shines from water into ice. The indices of refraction for water and ice are 1.3
WITCHER [35]

Answer:

The angle of refraction Ø2 equals 62.95° ≈ 63°

Explanation:

The relationship between the angles of incidence and

refraction , with respect to light or other waves passing through two different substances or media, such as glass, water or air is given by Snell's Law.

Snell's Law states that the when light travels from one medium to another, it generally refracts.

It is given by the mathematical expression;

[SinØ1°/SinØ2°] = [n2/n1]

Cross multiplying, we have;

n1 × SinØ1° = n2 × SinØ2°

where, n is the indices of refraction of each substance

Ø is the angle between the ray and the line normal to the surface.

Given the following values;

n1 = 1.36 n2 = 1.31 Ø1 = 30° Ø = ?

n1 × SinØ1° = n1 × SinØ2°

SinØ2° = [n1 × SinØ1°]/n2

substituting the values respectively;

SinØ2° = [1.36 × Sin30°]/1.31

SinØ2° = [1.36 × 0.5]/1.31

SinØ2° = 0.68 × 1.31

SinØ2° = 0.8906

Ø2° = Sin–¹(0.8906)

Ø2° = 62.95° ≈ 63°

4 0
3 years ago
No sistema representado abaixo, a massa do bloco A é igual a 2 kg, a do bloco B é igual a 8 kg.
blagie [28]

Answer:

Explanation:19,2 or 0/4 or 5 or 40,4

6 0
2 years ago
Pls help ASAP this questions are science questions ( biology chemistry physics)
Vilka [71]

Answer:

It would be A.

Explanation:

The scale goes from 0 to 14, With 0 being acidic and 14 being basic.

So if 7 is neutral, then anything less than 7 is moving more towards being more acidic.  Anything higher than 7 is moving towards being more basic.

4 0
3 years ago
Read 2 more answers
What is physics? In your own words too
denis23 [38]
The study of how the world works
4 0
2 years ago
Please help me! It states constant speed but moving in circular motion. I know there is acceleration due to a rate of change of
Morgarella [4.7K]
Direction of resultant force in circular motion is directed towards the center of the circle. Hence vector B is the direction of the resultant force.
8 0
3 years ago
Other questions:
  • The table below shows the acceleration of gravity on different bodies in the solar system.
    14·2 answers
  • What precaution should you take while towing a trailered boat?
    5·2 answers
  • Find the value of a x , the x-component of the object's acceleration.
    11·1 answer
  • When a hot metal cylinder is dropped into a sample of water, the water molecules _____________________ to reach the final temper
    10·2 answers
  • Sara is riding her bike down the road at 35 km/hr. She starts to peddle faster as she
    12·1 answer
  • What is the gravitational force between two students, John and Mike, if John has a mass of 81.0 kg, Mike has a mass of 93.0 kg,
    11·1 answer
  • I'll give the brainliest!
    12·1 answer
  • A 4 kg block is pulled with 4.1 N of force to the right. The block experiences 1.0 N of
    8·1 answer
  • I need heelp plzzzzz can anyone heelp mee
    5·2 answers
  • A plank of length L=2.200 m and mass M=4.00 kg is suspended horizontally by a thin cable at one end and to a pivot on a wall at
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!