Ask question

Ask question

All categories

3 years ago

7

Two stepped bar is supported at both ends.At the join point of two segments,the force F is applied(downwards).Calculate reactive

forces R1 and R3 at the supports.What is value of absolute maximal stress?
Choose one answer nearest your result.

given= d1=10mm d2=20mm L1=20mm L2=10mm E=200GPa F=20kN

1 answer:

nlexa [21]3 years ago

8 0

Answer:

F=200kN

Explanation:

You might be interested in

Two balanced Y-connected loads in parallel, one drawing 15kW at 0.6 power factor lagging and the other drawing 10kVA at 0.8 powe

NemiM [27]

Answer:

(a) attached below

(b) $pf_{C}=0.85$ $lagging$

(c) $I_{C} =32.37 A$

(d) $X_{C} =49.37$ Ω

(e) $I_{cap} =9.72 A$ and $I_{line} =27.66 A$

Explanation:

Given data:

$P_{1}=15 kW$

$S_{2} =10 kVA$

$pf_{1} =0.6$ $lagging$

$pf_{2}=0.8$ $leading$

$V=480$ $Volts$

(a) Draw the power triangle for each load and for the combined load.

$\alpha_{1}=cos^{-1} (0.6)=53.13$ °

$\alpha_{2}=cos^{-1} (0.8)=36.86$ °

$S_{1}=P_{1} /pf_{1} =15/0.6=25 kVA$

$Q_{1}=P_{1} tan(\alpha_{1} )=15*tan(53.13)=19.99$ ≅ $20kVAR$

$P_{2} =S_{2}*pf_{2} =10*0.8=8 kW$

$Q_{2} =P_{2} tan(\alpha_{2} )=8*tan(-36.86)=-5.99$ ≅ $-6 kVAR$

The negative sign means that the load 2 is providing reactive power rather than consuming

Then the combined load will be

$P_{c} =P_{1} +P_{2} =15+8=23 kW$

$Q_{c} =Q_{1} +Q_{2} =20-6=14 kVAR$

(b) Determine the power factor of the combined load and state whether lagging or leading.

$S_{c} =P_{c} +jQ_{c} =23+14j$

or in the polar form

$S_{c} =26.92$ °

$pf_{C}=cos(31.32) =0.85$ $lagging$

The relationship between Apparent power S and Current I is

$S=VI^{*}$

Since there is conjugate of current I therefore, the angle will become negative and hence power factor will be lagging.

(c) Determine the magnitude of the line current from the source.

Current of the combined load can be found by

$I_{C} =S_{C}/\sqrt{3}*V$

$I_{C} =26.92*10^3/\sqrt{3}*480=32.37 A$

(d) Δ-connected capacitors are now installed in parallel with the combined load. What value of capacitive reactance is needed in each leg of the A to make the source power factor unity?Give your answer in Ω

$Q_{C} =3*V^2/X_{C}$

$X_{C} =3*V^2/Q_{C}$

$X_{C} =3*(480)^2/14*10^3$ Ω

(e) Compute the magnitude of the current in each capacitor and the line current from the source.

Current flowing in the capacitor is

$I_{cap} =V/X_{C} =480/49.37=9.72 A$

Line current flowing from the source is

$I_{line} =P_{C} /3*V=23*10^3/3*480=27.66 A$

8 0

3 years ago

Estimate properties and pipe diameter Determine the diameter of a steel pipe that is to carry 2000 gal/min of gasoline with a pr

sp2606 [1]

Answer:

Diameter of pipe is 0.535 ft

Explanation:

see attachment, its works out 1st half

7 0

3 years ago

A metal wire of resistance R is cut into seven equal pieces that are then placed together side by side to form a new cable with

netineya [11]

Answer:

Explanation:

So therefore new Resistance R¹ = R/49

Resistance of a wire

R = ¶ * L/A

Where ¶ = resistivity of wire

L = length of wire

A = cross sectional area of wire

So therefore if the wire is cut into 7 equal lengths and joined together to form one with new Resistance R¹

So new length L¹ = 1L/7

New A¹ = 7A

So therefore R¹ = ¶ (L/7) /(7A)

So R¹ = ¶*L/A(49)

Since R = ¶L/A

So therefore R¹ = R/49

8 0

3 years ago

Which of the following statements is correct?

Reika [66]

Answer:

b. rivets are tempory fasteners that bind two plate of metals together

3 0

3 years ago

4. Which of the following is not part of a rear air-conditioning system?

Amanda [17]

Answer:

C. Rear AC compressor

Explanation:

Rear Ac compressor is not part of a rear air-conditioning system

4 0

3 years ago