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3 years ago

I Need help with this question

Engineering

1 answer:

ad-work [718]3 years ago

4 0

I’m in 6th grade I’m sorry

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Find the magnitude of the two pulling forces P and Q when their resultant is 50 N at 20° with Q. P 20°

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Two forces P and Q whose resultant is 10Newton are at right angles to each other. If P makes 30 degrees with resultant.Show me the workings of the magnitude of Q in Newton and the diagram of the vectors.

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3 years ago

The Ohm's Law formula used to calculate Voltage is:

Bogdan [553]

Answer:

V (voltage) = I (current) * R (resistor)

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3 years ago

How do you produce a well-constructed survey questionnaire?

Anni [7]

Answer:

Explanation:

Define the purpose of the survey.

Make every question count.

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Ask direct questions.

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3 years ago

Mercury flows inside a copper tube 9m long with a 5.1сm inside diameter at an average velocity of 7.0 m/s. The inside surface te

svp [43]

Answer:

rate of heat transfer = 9085708.80 W

Explanation:

Given:

Inside diameter, D = 5.1 cm

= 5.1 x $10^{-2}$ m

Average velocity, V = 7 m/s

Mean temperature, T = (66+38) /2

= 52°C

Therefore kinematic viscosity at 52°C is ν = 0.104 X $10^{-6}$ $m^{2}$ / s

Prandtl no., Pr = 0.021

We know Renold No. is

Re = $\frac{V\times D}{\nu }$

Re = $\frac{7\times 5.1\times 10^{-2}}{0.104\times 10^{-6}}$

= 3.432 X $10^{6}$

Therefore the flow is turbulent.

Since the flow is turbulent and the ratio of L/D is greater than 60 we can use Dittua-Boelter equation.

Nu = 0.023 $Re^{0.8}$ . $Pr^{0.3}$

= 0.023 x $(3.432 \times10^{6})^{0.8}$ x $(0.021)^{0.3}$

= 1221.52

Since Nu = $\frac{h.D}{k}$

h = $\frac{k\times Nu}{D}$

= $\frac{9.4\times 1221.52}{5.1\times 10^{-2}}$

= 225143.3

Therefore rate of heat transfer, q = h.A(T- $T_{\infty }$

q= 225143.3 x 2πrh ( 66-38)

= 225143.3 X 2π X $\frac{5.1\times10^{-2}}{2}\times 9\times 28$

= 9085708.80 W

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4 years ago

The purpose of a diamond-shaped yellow sign with black markings is to.

Anit [1.1K]

Answer:

it is to warn you about something like a dead end, or maybe where you should slow down because there might be people crossing ahead.

Explanation:

look at the signs i provided, all of them warn you about something.

Ex: railroad tracks, there might be a train passing, a winding road, so you don't go off road and crash, etc.

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2 years ago