If you represent velocity with an arrow, the length of the arrow represents -

The heat flux that is applied to one face of a plane wall is q″ = 20 W/m2. The opposite face is exposed to air at temperature 30

Blababa [14]

Answer:

400 W/m^2 and 31℃

Explanation:

The output heat flux q"= 20 W/m^2 (geven)

The output heat flux from.the wall to the air by convection

q"conv = h(ts - t∞)

q"conv = 20(50-30) = 400 W/m^2

Therefor, this case is unsteady and the wall temperature changes with time till the energy balance exist.

ENERGY BALANCE

The input energy must be equal to the output energy for steady state condition. If not the state will be unstaidy or transient.

2. Its noticed that the output heat flux is not that the I put heat flux, therefore the wall tempers will be decreased till the output heat flux is reduced to the value of the given input heat flux

T steady = T∞ +q"/h

= 30 + 20/20 = 31℃

3 0

3 years ago

A car was struck broadside, injuring the driver. you would expect that during the collision, the driver's:_________

il63 [147K]

The driver's Body was pushed laterally while the head remained still.

When two objects collide side-by-side (broadside), the head tends to stay static while the body is forced laterally, injuring the neck. The motorist would presumably be protected by a side-curtain airbag rather than hurt.

<h3>A Broadside Collision: What Is It? </h3>

A broadside collision happens when the front of one car bangs into the side of another, usually at a high rate of speed. Although catastrophic injuries can occur in any automobile accident on the road, broadside collisions are especially dangerous.

<h3>Where is the most likely location for broadside collisions?</h3>

The majority of broadside collisions happen at or near junctions. This is due to the fact that crossroads design makes it easy for a broadside collision to occur, especially when motorists are not paying attention. The likelihood of a broadside collision increases when several vehicles cross paths at an intersection.

learn more about collision here

<u>brainly.com/question/24915434</u>

#SPJ4

4 0

2 years ago

What is the reactance of a capacitor at a 8.0 Î¼F frequency of 56.0 Hz?

il63 [147K]

Answer:

35.55 ohm

Explanation:

C = 80 micro farad

F = 56 hertz

Reactance

Xc = 1 / (2 × pi × F × C)

Xc = 1 / ( 2 × 3.14 × 56 × 80 × 10^-6)

Xc = 35.55 ohm

8 0

4 years ago

The volume of a balloon an be approximated by V = 4 3 π r 3 V=43πr3. If air is leaking from the balloon at a rate of 56 cubic ce

11Alexandr11 [23.1K]

Answer:

The rate the radius of the balloon shrinking at the moment the radius is 5 centimeters is 0.1783 cm/s

Explanation:

Here we have

dV/dt = 56 cm³/s

$\frac{dV}{dt} = \frac{d}{dt}(\frac{4}{3}\pi r^3) = \frac{4}{3}\pi\cdot3r^2 \frac{dr}{dt}$

When the radius is 5 cm we have

$56 \hspace {0.09cm}cm^3/s= \frac{4}{3}\pi\cdot3\cdot 5^2 \cdot \frac{dr}{dt} = 314.16 \times \frac{dr}{dt}$

Therefore,

$56 \hspace {0.09cm}cm^3/s= 314.16 \hspace {0.09cm}cm^2\times \frac{dr}{dt}$

From which,

$\frac{dr}{dt} = 56 \hspace {0.09cm}cm^3/s \div314.16 \hspace {0.09cm}cm^2$

$\frac{dr}{dt} = 0.1783 \hspace {0.09cm}cm/s$

The rate the radius of the balloon shrinking at the moment the radius is 5 centimeters = 0.1783 cm/s.

6 0

3 years ago

Read 2 more answers

When two point charges are a distance dd part, the electric force that each one feels from the other has magnitude F.F . In orde

Harman [31]

Answer:

In order to make this force twice as strong, F' = 2 F, the distance would have to be changed to half i.e. r' = r/2.

Explanation :

The electric force between two point charges is directly proportional to the product of charges and inversely proportional to the square of the distance between charges. It is given by :

$F=\dfrac{kq_1q_2}{r^2}$

r is the separation between charges

$F\propto \dfrac{1}{r^2}$

$r=\sqrt{\dfrac{1}{F}}$

If F'= 2F

$r'=\dfrac{1}{\sqrt{2F} }$

In order to make this force twice as strong, F' = 2 F, the distance would have to be changed to half i.e. $r'=\dfrac{1}{\sqrt{2F} }$ . Hence, this is the required solution.

6 0

3 years ago