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5BL
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Mechanical Engineering
Date
Apr 3, 2024
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5
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±ctivity 1 Response
: Measure the temperature of the environment (ambient temperature), the human body
(both forehead and under the tongue), and two other objects in the room. Record this information in both
and
, and group the items into a category of either being in or out of equilibrium with the environment.
Using the human body as the system, state the direction of heat flow between the body and the environment
and explain why heat flows in this direction.
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±ctivity 2 Response: Use the °R temperature gun to measure the temperature of your hands both before and
after vigorously rubbing them together.
²ompare the temperature difference (if any) before and after, and
relate this to how the temperature change is providing information about how energy is changing form. Record
how long it takes for your hands to get back to thermal equilibrium, and explain how this occurs.
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Related Questions
You must select a submerged centrifuge multicellular pump for a borehole on a worksite that requires a flow of
1.500l/s. The borehole itself is 150m deep (see figure 5). If the outlet pipe has the following properties, then:
wwww
wwwwwww
Water outlet (open air)
wwww
Outlet pipe
L = 200m
Borehole
wwwww
Pump
f= 0.04 D = 38mm
Figure 5 Borehole and pumping schematic
A) Choose a pump from those presented in figure 6 (you must select the most adequate model) if there is no local
head-loss, only friction related head-loss. You must draw the complete characteristic curve for the pipe directly on
figure 6.;
B) Is cavitation an issue if NPSHrequired is 5m briefly discuss the results.
C) Determine the supplied power output by the pump (in kW) as well as the absorbed power output when the
pump reaches it's operational flow for the pump you have selected. |
N.B. Hypothesize that water in the borehole is level with the pump intake. The pump intake is the same diameter
as the outlet pipe. Patm-100…
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4-6-
SI
A six-liter, eight-cylinder, four- Stroke cycle
race car engine operates at 6000 RPM using stoichio-
metric nitromethane as fuel. Combustion efficiency.
is 99%, and the fuel input rate is 0.198 kg/see.
a- Volumetric efficiency of the engine [!]
b-Flow rate of air into the engine. [ kg/sec.:]
Calculate :
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A local camera station is tracking a UFO sigbting in the evening aky, Find the velocity and
acceleration of the UFO in the r and theta directions and then find the velocity and acceleration
in the x and y directions.
30
043 [rad/sec]
+.004308 [rad/sce"]
6000 [ft]
283 [f/sec]
12.011 [f/sec]
e (heta dot)
Y axis
X axis
arrow_forward
1)The mutual forces of gravitation depends on the law of action and reaction. [T or F]
2)The radius of gyration kx means the area concentrated into ring strip by y-axis [T or F]
1)we get concurrent forces, if there are three forces lines of action intersect at one point.[T or F]
arrow_forward
(The complete question is in the picture)
The force acting on an object is F = 3.50 [N]ˆi−5.20 [N]ˆj−2.30 [N]kˆ. The vector from the origin to the point where the force is applied is r = 3.50 [m]ˆi + 2.50 [N]ˆj. What is the vector torque with respect to the origin produced by this force?A. 10.9 [N.m]ˆi + 11.5 [N.m]ˆj − 27.0 [N.m]kˆB. −18.2 [N.m]ˆi + 8.75 [N.m]ˆjC. −5.75 [N.m]ˆi + 8.05 [N.m]ˆj − 27.0 [N.m]kˆD. −5.75 [N.m]ˆi − 8.05 [N.m]ˆj + 9.45 [N.m]k
arrow_forward
A particle is subjected to the action of two forces:
F1 = 2.5 i-3j+ 6 k [kN] and F2 = 5 i+6j-5k [kN]. The magnitude of the resultant
force is:
%3D
%3D
Select one:
Oa. FR=-8.139 [kN]
%3D
Ob. FR 8.139 [kN]
Oc. FR = 5 [kN]
Od. FR=-5 [kN]
Activate Win
ype here to seatch
445 PE
arrow_forward
5 of 6 (4 complete)
HW Sc
ic)
se
More Info
on
he
en
F=0.075x
F=0.035x
F=0,020x
Spring #1
Spring #2
A Spring #3
Elongation (x) [mm]
Print
Done
Clear Air
Force (F) [N]
arrow_forward
Find a state space representation of the network shown below when the output is the displacement on mt.
Let my = 2 kg, m₁ = 4kg, F = 10 N, b₁ = 1 Ns/m, b2 = 2 Ns/m, k₁ = 2 N/m, and k2 = 4 N/m,
Force of material
placed in truck bed
C7
Truck vehicle mass
Shock absorber
A Tire
Select the correct response:
[dx₁
dt
0 0
10
dx₂
00
1
24
1
dt
X₂
Xour][0 1 0 0] +F
dv
at
ww
dx₁
at
dx-
dt
du
dt
du
dt
10 1112
10
POIN
VI
[ou]= [0 1 0 0]
NIW
arrow_forward
D
600 N
4 m
900 N
E
A) F(ED).sin53= F(DC)
4 m
A
B
B) F(EC)=1500 N
6 m
C) F(DC).sin37 = F(ED)
force in member [ED] : F(ED)
force in member [DC] : F(DC)
D) F(ED).cos53 = F(DC)
force in member [BC] : F(BC)
E) F(DC).cos37 = F(BC)
Which following one is TRUE?
arrow_forward
A
B
C
D
E
Match the process, positions, and parts of an internal combustion engine using the figure.
G
H
[7]
C
K
A
D
B
✓ [Choose ]
Exhaust valve
Compression stroke
Intake stroke
Bottom Dead Center (BDC)
Intake valve
Combustion Chamber
Combustion/Power stroke
Piston
Top Dead Center (TDC)
Exhaust stroke
[Choose ]
[Choose ]
E
F
arrow_forward
In the Blasius equation
stream function:
j is a dímensionless plane
p(x, y)
f(n)
VDUX
Values of f are not given in Table 7.1, but one published
value is f(2.0) = 0.6500. Consider airflow at 6 m/s, 20°C,
and 1 atm past a flat plate. Atx= 1 m, estimate (a) the height
y; (b) the velocity, and (c) the stream function at 7= 2.0.
arrow_forward
3.An 80.000 (N] truck is going across a uniform 300,000[NJ bridge. The two
(purple) towers apply a normal force on the bridge (orange & black color)
upwards. The truck is 80[m] from the right tower and 50[m] from the left
tower.
50 [m]
sofm)
a. Draw a rigid body diagram for the bridge
3
b. Fill the table below
Rigid Body Diagram:
Force/Torque Table:
Forces
y
TA
Net
c. At the situation described above one of the supporting towers suddenly
collapses. What force (by what object on what other object in the picture) is
responsible for the collapse?
arrow_forward
(The complete question is in the picture)
A disk rotates with constant angular acceleration about an axis passing through its center of mass. At an instant, its angular speed is measured to be 20.0 [rad/s]. What is the angular speed of the disk after 2.00 [s] if it has revolved by 60.0 [rad] during this timeinterval?
A. 10.0 [rad/s]B. 20.0 [rad/s]C. 30.0 [rad/s]D. 40.0 [rad/s]
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NExy - (Ex)(2y)
r =
[NEx? - (ExP]INEY? - (Zy]
The table below shows fhe time in hours
spent
studging () of 6 grade 11 students and their Scores
on a test (y). Salve for Piarson Product Correl ation Caefficiont
2.
3.
4.
10
15
15
25
35
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Electricity use .12
Imagine a house with an annual space
heating demand of 8000 [kWh]. A heat
pump is used with a SCOP of 5. Grid
electricity is produced with a gas power
plant of efficiency 0.4. What is the
?electricity use of the heat pump
[kWh] 8000
[kWh] 1600
[kWh] 4000
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1. [-/2 Points]
DETAILS
SERPSE10 3.4.OP.006. 0/6 Submissions Used
A vector has an x component of -23.0 units and a y component of 41.6 units. Find the magnitude and direction of this vector.
magnitude
unit(s)
direction
° counterclockwise from the +x axis
Need Help?
Read It
Watch It
2. [-/3 Points]
DETAILS
SERPSE10 3.4.OP.008.MI. 0/6 Submissions Used
Obtain expressions in component form for the position vectors having the following polar coordinates.
(a) 12.6 m, 140° counterclockwise from the +x axis
(b) 3.80 cm, 40.0° counterclockwise from the +x axis
R-
cm
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A particle is subjected to the action
of two forces:
F1 = 4 i+7j+7 k [kN] and F2 = 5 i
- 6 j - 5 k [kN]. The coordinate
direction angle of the resultant
force with X-axis is:
Select one:
a. ar = 83.81°
b. ar = 31.93°
C. Ar = 13.93°
O d. ar = 166.07°
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TUT#04 - Vraag / Question 07
'n Konvergerende-divergerende mondstuk het 'n keel area van 10 [cm²] en 'n uitlaat area
van 20 [cm²]. Lug word voorsien vanaf 'n lug tenk met 250 [kPa] en 350 [K]. By 'n regte
kondisies die uitlaat kondisies is P. = 183 [kPa], T₁ = 340 [K] and V₂ = 144 [m/s].
e
1) Is daar 'n normaal skok in die mondstuk? Motiveer
2) Indien Ja, by watter Mach getal sal die normaal skok gebeur?
P = 250 [kPa]
T = 350 [K]
A₁ = 10 [cm²]
A₂ = 20 [cm²]
I P₂ = 183 [kPa]
Te = 340 [K]
V₂ = 144 [m/s]
A converging-diverging nozzle has a throat area of 10 [cm²] and an exit area of 20 [cm²].
It is supplied by an air tank at 250 [kPa] and 350 [K]. At one operating condition, the exit
properties are Pe = 183 [kPa], Te = 340 [K], and Ve = 144 [m/s].
1) Is there a normal shock inside the nozzle? Motivate
2) If so, at what Mach number does the normal shock occur?
arrow_forward
c) compressor power [Btu/hr], and
d) the refrigeration capacity [tons of refrigeration].
What is the ASHRAE refrigerant number with chemical formula CF3CH=CHC?
Uco the Trouton's constant to estimate the molar latent heat of vaporization
arrow_forward
For the following system, calculate the mode shapes
m
Select one:
[1]
O [1 ].[1 -0.5]'
[10.9848] [-1 0.1735]
ישר [ ] O
2
o e
*>
arrow_forward
Solving dynamics problems in steps:
1. Collect data and assumptions
2. Desired result?
3. Make drawing/sketch of the (sub)problem
4. Equations and calculations
5. Answer and conclusions
Furthermore:
- Write down the steps clearly
Check intermediate results (accuracy)
Dimension check and units!
Magnitude of number in line with expectation?
arrow_forward
Which set of ordered processes best describes the steps to safely change the drill bit?
Stop the machine, lower the spindle with handle, loosen the chuck using the key, insert new tool, tighten the
chuck with key, raise the spindle to original position.
All of the above.
Stop the machine, use the key to loosen the chuck, remove the drill, insert the tool in the chuck and tighten the
chuck.
Stop the machine, unclamp the part, align the drill bit with the center of the table, clamp the new bit.
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6cm
I
3em
Icm <-
Scr
]]
Icm
arrow_forward
The magnitude of the moment of the force F=300i-200j+300k N about the y-axis is.
0.3 m
0.4 m
0.2 m
F
B
Select one:
a. 20 [N.m]
b. 150 [N.m]
C. -20 [N.m]
O d. -150 [N.m]
arrow_forward
The rotating blade of a blender turns with a constant angular acceleration 1.50 [rad/s^2].a. How much time does it take to reach an angular velocity of 36.0 [rad/s^2] starting from rest?
b. Through how many revolutions does the blade turn in this time interval?
c. What are the tangential acceleration and tangential speed of an ant sitting on the blade 10.0 cm from the axis of rotation during the end of this interval?
d. What is the moment of inertia of the ant if its mass is 10.0 g?
e. What is the rotational kinetic energy of the ant?
arrow_forward
*O 42% 0 16:05
R
The tube, shown below, is supported by two
cables (AB) and (AC). A force F = 600 lb is
applied in cable AB. The component of the
force F acting along cable (AC) is:
3 ft,
F 8 ft-
C
В
12 ft
8 ft
y
F
15 ft
A
Select one:
a. 459.708 [lb]
b. 49.509 [lb]
с. 600 [lb]
d. 495.708 [lb]
II
arrow_forward
Build the pneumatic circuit in the following pneumatic sequence using the cascade method:
[A- B-] [C+ D- A+] [C- B+ D+]
arrow_forward
sample calculations
目
File Edit View Insert Format Data To
100%
$ % .0
.00 12:
fx |
A
1
Variable
Value
Units
diameter
height
m
4
volume
m^3
3
The image above shows a section of a Google sheet. What formula should be written in cell
B4 to calculate the volume of a cylinder with a diameter value in B2 and height in B3?
a) =0.25*PI()*B2^2 * B3
b) =PI()*B2^2 * B3
c) =pi*diameter^2 * height
d) =PI*B2^2 * B3
3 5
arrow_forward
Q4- A barometer dial (atmospheric air Pressure sensor) has the following specifications:
Pmin = 940 [mbar]
Pmax = 1060 [mbar]
1000
1010
990
A0 = 320 [deg]
Assuming the device is constructed, as shown, from:
• A cylindrical piston with a diameter
6
d :
[cm).
940
mbar
1060
A rack with an 8 [teeth/cm] pitch.
• A pinion gear-A with 15 [teeth]
• A pinion gear-B with Ng [teeth]
At nominal conditions:
P. = 1000 [mbar]
V. = 149.46 [cm³]
А В
If the dial is connected directly to pinion gear-B;
a) Calculate the required value for Ng ?
b) Why do we need to use two pinion gears instead
of one ?
Hint: Boyles' Law P,V = constant
d
1030 OPor
1020
1050
086
960
950
arrow_forward
|The following processes occurs in a rever sible thermodynamic cycle:
1-2: Reversible polytropic compression at pressure X)bar at volume Y)m' to a
pressure [Z]bar and specific volume (A]m'/kg. The index of compression may be
taken as n.
2-3: Reversibly expansion with expansion index of 2 to pressure [B/bar.
3-1: Reversible cooling at constant volume to the initial state.
arrow_forward
Build the pneumatic circuit in the following pneumatic sequence using the cascade method:
[A+ B+] [A- B- C+ A+] [B+ A- B- C-]
arrow_forward
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- You must select a submerged centrifuge multicellular pump for a borehole on a worksite that requires a flow of 1.500l/s. The borehole itself is 150m deep (see figure 5). If the outlet pipe has the following properties, then: wwww wwwwwww Water outlet (open air) wwww Outlet pipe L = 200m Borehole wwwww Pump f= 0.04 D = 38mm Figure 5 Borehole and pumping schematic A) Choose a pump from those presented in figure 6 (you must select the most adequate model) if there is no local head-loss, only friction related head-loss. You must draw the complete characteristic curve for the pipe directly on figure 6.; B) Is cavitation an issue if NPSHrequired is 5m briefly discuss the results. C) Determine the supplied power output by the pump (in kW) as well as the absorbed power output when the pump reaches it's operational flow for the pump you have selected. | N.B. Hypothesize that water in the borehole is level with the pump intake. The pump intake is the same diameter as the outlet pipe. Patm-100…arrow_forward4-6- SI A six-liter, eight-cylinder, four- Stroke cycle race car engine operates at 6000 RPM using stoichio- metric nitromethane as fuel. Combustion efficiency. is 99%, and the fuel input rate is 0.198 kg/see. a- Volumetric efficiency of the engine [!] b-Flow rate of air into the engine. [ kg/sec.:] Calculate :arrow_forwardA local camera station is tracking a UFO sigbting in the evening aky, Find the velocity and acceleration of the UFO in the r and theta directions and then find the velocity and acceleration in the x and y directions. 30 043 [rad/sec] +.004308 [rad/sce"] 6000 [ft] 283 [f/sec] 12.011 [f/sec] e (heta dot) Y axis X axisarrow_forward
- 1)The mutual forces of gravitation depends on the law of action and reaction. [T or F] 2)The radius of gyration kx means the area concentrated into ring strip by y-axis [T or F] 1)we get concurrent forces, if there are three forces lines of action intersect at one point.[T or F]arrow_forward(The complete question is in the picture) The force acting on an object is F = 3.50 [N]ˆi−5.20 [N]ˆj−2.30 [N]kˆ. The vector from the origin to the point where the force is applied is r = 3.50 [m]ˆi + 2.50 [N]ˆj. What is the vector torque with respect to the origin produced by this force?A. 10.9 [N.m]ˆi + 11.5 [N.m]ˆj − 27.0 [N.m]kˆB. −18.2 [N.m]ˆi + 8.75 [N.m]ˆjC. −5.75 [N.m]ˆi + 8.05 [N.m]ˆj − 27.0 [N.m]kˆD. −5.75 [N.m]ˆi − 8.05 [N.m]ˆj + 9.45 [N.m]karrow_forwardA particle is subjected to the action of two forces: F1 = 2.5 i-3j+ 6 k [kN] and F2 = 5 i+6j-5k [kN]. The magnitude of the resultant force is: %3D %3D Select one: Oa. FR=-8.139 [kN] %3D Ob. FR 8.139 [kN] Oc. FR = 5 [kN] Od. FR=-5 [kN] Activate Win ype here to seatch 445 PEarrow_forward
- 5 of 6 (4 complete) HW Sc ic) se More Info on he en F=0.075x F=0.035x F=0,020x Spring #1 Spring #2 A Spring #3 Elongation (x) [mm] Print Done Clear Air Force (F) [N]arrow_forwardFind a state space representation of the network shown below when the output is the displacement on mt. Let my = 2 kg, m₁ = 4kg, F = 10 N, b₁ = 1 Ns/m, b2 = 2 Ns/m, k₁ = 2 N/m, and k2 = 4 N/m, Force of material placed in truck bed C7 Truck vehicle mass Shock absorber A Tire Select the correct response: [dx₁ dt 0 0 10 dx₂ 00 1 24 1 dt X₂ Xour][0 1 0 0] +F dv at ww dx₁ at dx- dt du dt du dt 10 1112 10 POIN VI [ou]= [0 1 0 0] NIWarrow_forwardD 600 N 4 m 900 N E A) F(ED).sin53= F(DC) 4 m A B B) F(EC)=1500 N 6 m C) F(DC).sin37 = F(ED) force in member [ED] : F(ED) force in member [DC] : F(DC) D) F(ED).cos53 = F(DC) force in member [BC] : F(BC) E) F(DC).cos37 = F(BC) Which following one is TRUE?arrow_forward
- A B C D E Match the process, positions, and parts of an internal combustion engine using the figure. G H [7] C K A D B ✓ [Choose ] Exhaust valve Compression stroke Intake stroke Bottom Dead Center (BDC) Intake valve Combustion Chamber Combustion/Power stroke Piston Top Dead Center (TDC) Exhaust stroke [Choose ] [Choose ] E Farrow_forwardIn the Blasius equation stream function: j is a dímensionless plane p(x, y) f(n) VDUX Values of f are not given in Table 7.1, but one published value is f(2.0) = 0.6500. Consider airflow at 6 m/s, 20°C, and 1 atm past a flat plate. Atx= 1 m, estimate (a) the height y; (b) the velocity, and (c) the stream function at 7= 2.0.arrow_forward3.An 80.000 (N] truck is going across a uniform 300,000[NJ bridge. The two (purple) towers apply a normal force on the bridge (orange & black color) upwards. The truck is 80[m] from the right tower and 50[m] from the left tower. 50 [m] sofm) a. Draw a rigid body diagram for the bridge 3 b. Fill the table below Rigid Body Diagram: Force/Torque Table: Forces y TA Net c. At the situation described above one of the supporting towers suddenly collapses. What force (by what object on what other object in the picture) is responsible for the collapse?arrow_forward
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