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3 years ago

Determine the voltage which must be applied to a 1 k 2 resistor in order that a current of

Engineering

1 answer:

sergey [27]3 years ago

5 0

Answer:

The correct solution is "20 volt".

Explanation:

Given that:

Current,

I = 10 mA

or,

= $10\times 10^{-3} \ A$

Resistance,

R = 2 K ohm

or,

= $1\times 10^3 \ ohm$

Now,

The voltage will be:

⇒ $V=IR$

By putting the values, we get

$=10\times 10^{-3}\times 2\times 10^{3}$

$= 20 \ volt$

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What is the dimensionless heat conduction rate for a sphere at surface temperature T1 buried in an infinite medium of temperatur

dexar [7]

Solution :

The dimensionless conduction heat rate, $q_{ss}^*$

$q_{ss}^*=\frac{q\times L_c}{K A_s(T_1-T_2)}$ ...........(1)

where $L_c$ = characteristic length

$=\left(\frac{A}{4\pi} \right)^{1/2}. \sqrt{\frac{D^2}{4}}$

A is surface area

q = heat transfer

$q=Sk(T_1-T_2)$ ..................(2)

where, S = conductor shape factor

Now substituting (2) in (1),

$q_{ss}^* = \frac{Sk(T_1-T_2)L_c}{kA(T_1-T_2)}$

$q_{ss}^* = \frac{S \times L_c}{A}$

$q_{ss}^* = \frac{S \times D/2}{\pi D^2}$

$q_{ss}^* = \frac{S \times D}{2\pi D^2}$ ...................(3)

For a sphere, we know S = 2πD

Putting this in (3),

$q_{ss}^* = \frac{2 \pi D \times D}{2\pi D^2}$

$q_{ss}^* = \frac{2 \pi D^2}{2\pi D^2}$

$q_{ss}^* = 1$

Therefore, the dimensionless heat conduction rate for a sphere is 1.

7 0

3 years ago

What is the effect of the workpiece specific cutting energy on the cutting forces, and why?

ella [17]

Explanation:

Specific cutting energy:

It the ratio of power required to cut the material to metal removal rate of material.If we take the force required to cut the material is F and velocity of cutting tool is V then cutting power will be the product of force and the cutting tool velocity.

Power P = F x V

Lets take the metal removal rate =MRR

Then the specific energy will be

$sp=\dfrac{F\times V}{MRR}$

If we consider that metal removal rate and cutting tool velocity is constant then when we increases the cutting force then specific energy will also increase.

8 0

4 years ago

Help thank you <3 :DDD

Vika [28.1K]

Answer:

Explanation:

its B

4 0

3 years ago

Need help with these 3 questions pls help

Burka [1]

Answer:

Explanation:

First one is passion i think

second one is true im not sure

Third one is Time managaemant

Hope this helps!

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3 years ago

The objective of a properly proportioned concrete mix are: a.__________________________________________________________ b.______

sukhopar [10]

Answer:

The objective of a properly proportioned concrete mix are:

To produce the combination of cementitious material, water, and aggregate that meets the requirements of a particular structure, portion of a structure, or series of structures at least cost.
To produce concrete of the specified properties.
To produce a satisfactory of end product, such as beam, column or slab as economically as possible.

Cheers!

4 0

3 years ago

Read 2 more answers