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2 years ago

Arc blow typically occurs in steel and metals that contain iron. True or false

Engineering

2 answers:

nikklg [1K]2 years ago

5 0

Answer:

Explanation:

because if you do its right

sleet_krkn [62]2 years ago

4 0

Answer: True

Explanation: Iron is magnetic

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The mean of hours that the average person watches television each day is 4.18 hours with a standard deviation of 1.19 hours. Fin

luda_lava [24]

Answer:

$z = \frac{3-4.18}{1.19}=-0.992$

$z = \frac{5-4.18}{1.19}=0.689$

And we can find this probability with this difference:

$P(-0.992$

And then we can conclude that the probability that someone watches between 3 and 5 hours a day is approximately 0.591 using a normal distribution

Explanation:

For this case we can define the random variable X as "hours that a person watches television". For this case we don't have the distribution for X but we have the following parameters:

$\mu = 4.18,\sigma =1.19$

We can assume that the distribution for X is normal

$X \sim N(\mu = 4.18 , \sigma =1.19)$

And we want to find this probability:

$P(3$

And we can use the z score formula given by:

$z=\frac[X- \mu}{\sigma}$

And we can find the z score for each limit and we got:

$z = \frac{3-4.18}{1.19}=-0.992$

$z = \frac{5-4.18}{1.19}=0.689$

And we can find this probability with this difference:

$P(-0.992$

And then we can conclude that the probability that someone watches between 3 and 5 hours a day is approximately 0.591 using a normal distribution

6 0

2 years ago

Su prepares a presentation about the industrial revolution. She wants to change the font on the second slide of her presentation

choli [55]

Font of the slide can be edited in the presentations :-

Explanation

By following these steps Su can change the presentation font of her second slide.

1. Edit- As Su open her second slide , there will be a option of "Edit" on the top right corner of the screen.

2. Font- As the various options are available on the screen such as font size , add image etc ,click on the option "Font"

3. Drop Down- As you click on font option , it will be followed by a drop down option with various type of fonts. Su can select the font she wishes to add in her presentation and look it more precise by adjusting the Font Size.

4 Save- Save the changes made in the slide for future.

8 0

2 years ago

1. What most commonly joins the structural panels of

notka56 [123]

Answer:

Explanation:

becasue it is

5 0

2 years ago

The 2-lb block is released from rest at A and slides down along the smooth cylindrical surface. Of the attached spring has a sti

MA_775_DIABLO [31]

Answer:

L = 4.574 ft

Explanation:

Given:

- The weight of the block W = 2 lb

- The initial velocity of the block v_i = 0

- The stiffness of the spring k = 2 lb/ft

- The radius of the cylindrical surface r = 2 ft

Find:

Determine its unstretched length so that it does not allow the block to leave the surface until θ= 60°.

Solution:

- Compute the velocity of the block at θ= 60°. Use Newton's second equation of motion in direction normal to the surface.

F_n = m*a_n

Where, a_n is the centripetal acceleration or normal component of acceleration as follows:

a_n = v^2_2 / r

- Substitute:

F_n = m*v^2_2 / r

Where, F_n normal force acting on block by the surface is:

F_n = W*cos(θ)

- Substitute:

W*cos(θ) = m*v^2_2 / r

v_2 = sqrt ( r*g*cos(θ) )

- Plug in the values:

v^2_2 = 2*32.2*cos(60)

v^2_2 = 32.2 (ft/s)^2

- Apply the conservation of energy between points A and B where θ= 60° :

T_A + V_A = T_B + V_B

Where,

T_A : Kinetic energy of the block at inital position = 0

V_A: potential energy of the block inital position

V_A = 0.5*k*x_A^2

x_A = 2*pi - L ..... ( L is the original length )

V_A = 0.5*2*(2*pi - L)^2 =(2*pi - L)^2

T_B = 0.5*W/g*v_2^2 = 0.5*2 / 32.2 *32.2 = 1

V_B = 0.5*k*x_B^2 + W*2*cos(60)

x_B = 2*0.75*pi - L ..... ( L is the original length )

V_B = 0.5*2*(1.5*pi - L)^2 + 2*1 = 2 + ( 1.5*pi - L )^2

- Input the respective energies back in to the conservation expression:

0 + (2*pi - L)^2 = 1 + 2 + ( 1.5*pi - L )^2

4pi^2 - 4*pi*L + L^2 = 3 + 2.25*pi^2 - 3*pi*L + L^2

pi*L = 1.75*pi^2 - 3

L = 4.574 ft

3 0

2 years ago

Using the images below, read and record each of the three measurements of the sample wire diameter at different points along its

sveta [45]

Explanation:

clock in a band of brothers in a band of the strength of a person

4 0

2 years ago