Answer:
i
Explanation:
Air is contained inside a vertical piston-cylinder assembly by a piston of mass 105 kg and face area of 0.05 m2 . The mass of air inside the cylinder is 20 grams, and the air initially occupies a volume of 50 liters. The atmosphere exerts a pressure of 101.3 kPa on the top of the piston. The volume of the air slowly decreases to 0.005 m3 , while maintaining constant pressure, as the specific internal energy of the air decreases by 175 kJ/kg. Neglecting friction between the piston and the cylinder wall, determine the heat between the surroundings and the air inside the piston-cylinder assembly in kJ
Answer:
ΔQ = 1.06 KJ
Explanation:
The amount of heat transfer between the piston-cylinder system and the surrounding can easily be found by using the First Law of Thermodynamics. The first law of thermodynamics can be written as follows:
ΔQ = ΔU + W
ΔQ = mΔu + PΔV
where,
ΔQ = Heat transfer between system and surrounding = ?
Δu = specific change in internal energy of the system = - 175 KJ/kg
m = mass of air = 20 g = 0.02 kg
P = Constant Pressure = 101.3 KPa
ΔV = Change in Volume = 0.05 m³ - 0.005 m³ = 0.045 m³
Therefore,
ΔQ = (0.02 kg)(-175 KJ/kg) + (101.3 KPa)(0.045 m³)
ΔQ = -3.5 KJ + 4.56 KJ
ΔQ = 1.06 KJ
Using the Equilibrium Equation (F1d1 = F2d2), find F1, if d1 = 30ft, and F2 = 1050lb, and d2=22ft. Please state your answer in pounds and round to the nearest whole number.
Answer:
77 lb
Explanation:
Equation: F₁d₁ = F₂d₂
Knowns:
d₁ = 30 ft
F₂ = 105 lb
d₂ = 22 ft
Solving for F₁:
1). F₁•30 = 105•22
2). F₁•30=2,310
3).[tex]\frac{F_1\cdot 30}{30}=\frac{2310}{30}[/tex]
4). F₁ = 77 lb
a. An 80-percent efficient pump with a power input of 20 hp is pumping water from a lake to a nearby pool at ar ate of 1.5 ft3 /s through a constant-diameter pipe. The free surface of the pool is 80 ft above that of the lake. Determine the mechanical power used to overcome frictional effects in piping.
b. Water is pumped from a lake to a storage tank 15 m above at a rate of 70 L/s while consuming 15.4 kW of electric power. Disregarding any frictional losses in the pipes and any changes in kinetic energy. Determine:
1. The overall efficiency of the pump–motor unit.
b. The pressure difference between the inlet and the exit of the pump.
Answer:
A) mechanical power used to overcome frictional effects in piping = 2.373 HP
B) efficiency = 66.82%
Pressure difference = 147 KPa
Explanation:
We are given;
efficiency of pump; η = 80% = 0.8
power input of pump;P_pump,in = 20 hp
rate being pumped; Q = 1.5 ft³/s = 0.04248 m³/s
free surface of pool; Δz = 80 ft = 24.384 m
mechanical pumping power used to deliver water is;
W_u = η × P_pump,in
W_u = 0.8 × 20
W_u = 16 Hp
Now, change in total mechanical energy of water will be equal to the change in potential energy.
Thus, it is expressed as;
ΔE_mech = ρ × Q × g × Δz
Where ρ is density of water = 1000 kg/m³
Thus;
ΔE_mech = 1000 × 0.04248 × 9.81 × 24.384 = 10,161.5150592 J/s
Converting to HP gives;
ΔE_mech = 13.627 HP
Now, mechanical power used to overcome frictional effects is given by;
W_frict = W_u - ΔE_mech
W_frict = 16 - 13.627
W_frict = 2.373 HP
B) We are now given;
W_elect,in = 15.4 KW
Volumetric flow rate; q = 70 l/s = 0.07 m³/s
Height; h = 15 m
Mass flow rate; m' = qρ
Where ρ is density of water = 1000 kg/m³.
m' = 0.07 × 1000
m' = 70 kg/s
Now,
ΔE_mech = workdone through height of 15m
Thus;
ΔE_mech = m'gh
ΔE_mech = 70 × 9.8 × 15
ΔE_mech = 10,290 W = 10.29 Kw
efficiency of the pump–motor unit = ΔE_mech/(W_elect,in) = 10.29/15.4 = 0.6682 or 66.82%
Pressure difference = ρgh = 1000 × 9.8 × 15 = 147,000 Pa = 147 KPa
Refrigerant-134a at 1 MPa and 100 C is to be cooled to 1 MPa and 28 C in a condenser by air. The air enters at 125 kPa and 25 C with a mass flow rate of 697 kg/min and leaves at 97 kPa and 58 C. Determine the mass flow rate of the refrigerant. Assume air has a constant heat capacity determined at room temperature. Report the mass flow rate of the refrigerant in kg/min with one decimal digit, for example 95.3 or 105.6.
From the top of a vertical cliff 80m high, the angles of depression of 2 buoys lying due west of the cliff are 23° and 15° respectively. How far are the buoys apart?
Answer:
110 m
Explanation:
The geometry of the problem can be modeled by a right triangle. The height of the cliff forms one leg, and the distance to a buoy forms the other leg. The angle of depression is opposite the height of the cliff. An appropriate trig relation is ...
Tan = Opposite/Adjacent
Solving for the Adjacent side (the distance to the buoy), we find ...
Adjacent = Opposite/Tan
distance to buoy 1 = (80 m)/tan(23°) ≈ 188.468 m
distance to buoy 2 = (80 m)/tan(15°) ≈ 298.564 m
Then the distance between the buoys is ...
298.564 -188.468 m ≈ 110 m
The buoys are about 110 meters apart.
“We’re late for homeroom,” said Bonnie, surprised to hear herself say “we.” “EARL is a tool, Bonnie’s mother kept reminding her, not a friend or a puppy. ‘Don’t anthropomorphize it, honey,’ Bonnie’s mom said one night after she found Bonnie dancing around her bedroom with the metal contraption. ‘It’s a walking blender. Never forget that.”
QUESTION: What does, "Anthropomorphize" means in the sentences above?
(A) It means to program a robot so that it acts in a robotic or unnatural way?
(B) Or it means to give human characteristics to an object or animal?
(C) To make a human act more like an animal and less of a human?
(D) Or to make a human act more like an animal and less of a human?
Answer correctly
Will give Brainliest, a THX, friend request, and will rate ur answer
Answer:
Hi there
Your answer is:
B.
Explanation:
The "metal contraption", as the text goes on to say, is treated like a friend to Bonnie. Her mom comments on this by contrasting the metal contraption to a puppy.
Hope this helps
Explain how to properly engage the safety latches on the Stan Design Pit Jack.
The way to properly engage the safety latches on the Stan Design Pit Jack is:
Connect the hydraulic jack.Make sure it is properly lubricated.Ensure that the rolling bridge jack is well fused together.Use the machine.What is the Stan Design Pit Jack?This refers to the machination which makes use of pit jacks to execute tire rotation in a fast lube pit.
We can note that based on the design, this machine is put in the pit of a car and then rolls back and forth and perform their operations on both the front and real axles.
Hence, it is important to note that the safety latches are designed to prevent work accidents and it is important to properly lubricate the parts to prevent damage.
Read more about safety latches here:
https://brainly.com/question/24573204
How long would a piece of wood need to be to make a diagonal brace for a rectangle that measures 4 inches by 3 inches? Use the Pythagorean theorem, a² + b² = c², to determine the answer. 5 inches 7 inches 12 inches 25 inches Select the correct answer.
Answer:
Length of a diagonal = 5 inches
Explanation:
Let [tex]a[/tex] and [tex]b[/tex] the sides of the rectangle and [tex]c[/tex] be the diagonal of the rectangle.
According to the Pythagorean theorem, sum of squares of base and perpendicular is equal to the square of hypotenuse.
As each angle of the rectangle is a right angle,
[tex]a^2+b^2=c^2[/tex]
Put [tex]a=4\,,\,b=3[/tex]
[tex]4^2+3^2=c^2\\16+9=c^2\\25=c^2\\\sqrt{25}=c\\ 5=c[/tex]
So,
Length of a diagonal = 5 inches
Deviations from the engineering drawing can’t be made without the approval of the
Engineer's approvall makes it appropriate to alter from the drawing
What is Engineering drawing?Engineering drawing is a document that contain the design of an engineer represented in a sketch.
deviating fron the drawing is same as deviating from the design. it is therefore necessary to call the engineers attention before altering the drawing.
Read more on Engineering drawing here: https://brainly.com/question/15180981
whats your answer Where is the strangest place you’ve urinated or defecated?
Answer:At the train station
Explanation:
Answer:
in those camping portal pottys
Whose responsibility is it to provide a safe and healthy workplace?
Answer:
Under the OSH law, employers have a responsibility to provide a safe workplace. This is a short summary of key employer responsibilities: Provide a workplace free from serious recognized hazards and comply with standards, rules and regulations issued under the OSH Act.
credits to google
Explanation:
Answer:
employers
Explanation:
because they are responsible.
A completely reversible heat engine operates with a source at 1500 R and a sink at 560 R. At what rate must heat be supplied to this engine, in Btu/h, for it to produce 5 hp of power?
Answer: iy had around 5000 R
Explanation:
A rope is wrapped three and a half times around a cylinder. Determine the range of force T exerted on
the free end of the rope for maintaining equilibrium that is required to just support a 5 kN weight. The
coefficient of friction between the rope and the cylinder is 0.2
The range of force exerted at the end of the rope is; 285.7 N to 1,000 N.
What is the Net horizontal force?The net horizontal force of the cylinder when it is at equilibrium position can be found by applying Newton's second law of motion. Thus;
∑F = 0
F - μF_n = 0
We are given;
F_n = 5 kN = 5000 N
μ = 0.2
Thus;
F - 0.2(5,000) = 0
F - 1,000 = 0
F = 1,000 N
The strength of the applied force will be increasing as the number of turns of the rope increases. Thus;
Minimum force = Total force/number of turns of rope
Since rope is wrapped three and half times, then;
number of turns = 3.5
Thus;
minimum force = 1,000/3.5
minimum force = 285.7 N
Thus, the range of force exerted at the end of the rope is 285.7 N to 1,000 N.
Read more about net horizontal force at; https://brainly.com/question/26957287
What make metal ductwork more desirable than flex duct?
Less friction loss
Less chance of restriction
More direct routes to boots
All of the above
7)
Given a series silicon diode circuit with the resistor R=2 ko ohms and an applied voltage of 10
V, what is Ipg?
A) 0.5 mA
B) 10 mA
C) 4.65 mA
D) 1.0 mA
Answer:
C) 4.65 mA
Explanation:
The series circuit will have a voltage drop of about 0.7 V across the silicon diode, so the voltage drop across the 2 kΩ resistor is 10 -0.7 = 9.3 V. The current through the resistor is given by Ohm's Law:
I = V/R = 9.3 V/(2 kΩ)
I = 4.65 mA
How can you tell whether a trash container is for regular or biohazardous waste?.
An experimental arrangement for measuring the thermal conductivity of solid materials involves the use of two long rods that are equivalent in every respect, except that one is fabricated from a standard material of known thermal conductivity kA while the other is fabricated from the material whose thermal conductivity kB is desired. Both rods are attached at one end to a heat source of fixed temperature Tb, are exposed to a fluid of temperature [infinity] T[infinity], and are instrumented with thermocouples to measure the temperature at a fixed distance x1 from the heat source. If the standard material is aluminum, with kA= 200 W/m·K, and measurements reveal values of TA= 75°C and TB= 70°C at x1 for Tb= 100°C and [infinity] T[infinity]= 25°C, what is the thermal conductivity kB of the test material?
Answer: the thermal conductivity of the second material is 125.9 W/m.k
Explanation:
Given that;
The two rods could be approximated as a fins of infinite length.
TA = 75°C, θA = (TA - T∞) = 75 - 25 = 50°C
TB = 70°C θB = (TB - T∞) = 70 - 25 = 45°C
Tb = 100°C θb = (Tb - T∞) = (100 - 25) = 75°C
T∞ = 25°C
KA = 200 W/m · K , KB = ?
Now
The temperature distribution for the infinite fins are given by
θ/θb = e^(-mx)
θA/θb= e^-√(hp/A.kA) x 1 --------------1
θB/θb = e^-√(hp/A.kB) x 1---------------2
next we take the natural logof both sides,
ln(θA/θb) = -√(hp/A.kA) x 1 ------------3
In(θB/θb) = -√(hp/A.kB) x 1 ------------4
now we divide 3 by 4
[ ln(θA/θb) /in(θB/θb)] = √(KB/KA)
we substitute
[ In(50/75) /In(45/75)] = √(KB/200)
In(0.6666) / In(0.6) = √KB / √200
-0.4055/-0.5108 = √KB / √200
0.7938 = √KB / 14.14
√KB = 11.22
KB = 125.9 W/m.k
So the thermal conductivity of the second material is 125.9 W/m.k
Lynx eat snowshoe hares, and snowshoes hears eat plants. Which term can be applied to the lynx in this food chain example? Primary consumer predator secondary consumer
Answer:
primary consumer because YES
Answer:predator and secondary consumer
Explanation:
(TCO 6) A cable company is running a fiber-optic link between the head end and a neighborhood five miles away. The signal applied to the fiber goes through an optical connector having 3dB LOSS at the head end, the fiber has a LOSS of 1 dB, and the connector at the end of the fiber has a LOSS of 3 dB before being applied to an amplifier used to make up for the losses. The desired signal at the output of the amplifier is 10 dBm, and the signal level applied to the fiber connector at the head end is 10 dBm. What should the gain of the amplifier be to have 10 dBm at the output of the neighborhood amplifier
Answer:
7 dB
Explanation:
The total loss from the headend to the amplifier input is the sum of the losses along the fiber, that we simply add as they are in dBs:Total Loss = 3 dB + 1 dB + 3 dB = 7 dBThe signal at the amplifier input is just +10 dBm- 7 dB = +3 dBmSo as the output level at the Headend and the one at the output of the neighborhood amplifier must be equal each other (compensating all losses in the path), the amplifier gain must be equal to the cumulative loss, i.e. , 7 dB, so that the amplifier output level be + 10 dBm.Please give me the answers
Answer:
Water ferries
what is this answer Is cereal soup?
Answer:
depend what cereal yeha
Explanation:
no explanation
What’s is the answer
Clarisse is an architect. What skills will she apply to integrate her visualized solutions with other aspects such as business and industry standards? Clarisse will apply BLANK skills to integrate her visualized solutions with other aspects such as business and industry standards.
Answer:
Conceptual problem-solving skills
Explanation:
Conceptual problem-solving is a way of solving problems by applying what we know to what we do not know. For Clarisse who is an architect, the knowledge she has about visualization, and the concepts of the business world are not quite related.
So to integrate her visualization solutions to business standards, she would have to compare the two spheres of knowledge to determine how to adapt one t the other.
Answer:
Management skills
Explanation:
Bit of a shot in the dark here, but, and i quote:
"Management skills comprise planning, organizing, and coordinating a project to reach a goal. Architects apply management skills to integrate their visualized solutions with other aspects such as business and industry standards."
Hopefully this works out for ya'll.
What is rainfall intensity
Answer:
Rainfall intensity is defined as the ratio of the total amount of rain (rainfall depth) falling during a given period to the duration of the period It is expressed in depth units per unit time, usually as mm per hour (mm/h).
Answer:
the ratio of the total amount of rain (rainfall depth) falling during a given period to the duration of the period
if you play roblox leave user down bellow
Answer:
why dont you make friends on roblox lol might be safer
Explanation:
Answer:
yes i play roblox
Explanation:
But why are you asking this type of Question
All of these are true about aluminum EXCEPT that it:
A) has a self-healing, corrosion-resistant coating.
B) is resistant to galvanic corrosion.
C) is a nonferrous metal.
D) is easy to be initially formed.
All of the aforementioned are true characteristics and properties of aluminum except: B. is resistant to galvanic corrosion.
What is aluminum?Aluminum can be defined as a silvery white metal and it is considered to be the most abundant metal found in the Earth's crust. Also, it is represented with the chemical symbol "Al" and it has an atomic number of thirteen (13).
This ultimately implies that, aluminum is found in Group 3 on the periodic table because it has three (3) valence electrons, which are found in the outermost shell of its atomic nucleus.
The characteristics and properties of aluminum.Some of the characteristics and properties of aluminum include the following:
It has a self-healing and corrosion-resistant coating.It is a nonferrous metal.It is easy to be initially manufacture or formed.Read more on aluminum here: https://brainly.com/question/25869623
Calculate the current in the coiled heating element of a 240-V stove. The resistance of the element is 60 ohms at its operating temperature.
Answer:
4 A
Explanation:
Current is found using Ohm's law.
I = V/R
I = (240 volts)/(60 ohms) = 4 A
The heating element current is 4 amperes.
Technician A says that a circuit with continuity reads 0 ohms. Technician B says that an open circuit reads 0 ohms. Who is correct
Answer:
A
Explanation:
An open circuit has infinite resistance, not 0. A circuit with continuity usually measures a few ohms or less, depending on the length and gauge of the wire and the condition of the connections. Often, on a general-purpose ohmmeter, the reading is very near 0 ohms.
Technician A is correct.
In lighting system, why it is important to consider maintenance factor?
Answer: The maintenance factor of a lighting system reflects how much of the initial luminous flux is still available at the end of its useful life. The planned lighting engineer must compute the maintenance factor and multiply the new value of the light output by it.
Explanation:
Answer:
Explanation: A lighting system's maintenance factor indicates how much of the initial luminous flux remains available at the end of its service life. The maintenance factor must be determined by the planning lighting engineer and the new value of the luminous flux multiplied by it.
When a current carrying coil is placed between the magnetic poles a force acts on it that causes it to rotate what can be done to make the coil rotate faster
Answer:
increase the field strengthincrease the currentdecrease the moment of inertia of the coilExplanation:
The rotation speed depends on the force applied to the coil, and on the mass (moment of inertia) of the coil. The force can be increased by ...
increasing the magnetic field strength
increasing the coil current
And the moment of inertia can be decreased by ...
making the coil lighter
making the coil more compact.
Any of these changes will increase the rotation speed.