Answer:
option b and E are true
Explanation:
A lever is an example of a rigid bar that can rotate around a given point. In a rigid material, the existing distance does not change whenever any load is placed on it. In such a material, there can be no deformation whatsoever. Wit this explanation in mind:
option a is incorrect, given that we already learnt that no deformation of any kind happens in a rigid bar.
option b is true. A rigid bar remains unchanged regardless of the load that it carries.
option c is incorrect, a rigid bar does not deform with loads on it
option d is incorrect. A lever is a type of rigid bar, a rigid bar can rotate around a support.
option e is true. A rigid bar would not experience any deformation whatsoever.
24Ω
When resistors are connected in parallel, the reciprocal of their combined resistance, when read with a DMM (Digital Multimeter - for measuring various properties of a circuit or circuit element such as resistance...) is the sum of the reciprocals of their individual resistances.
For example if two resistors of resistances R₁ and R₂ are connected together in parallel, the reciprocal of their combined resistance Rₓ is given by;
=
+
Solving for Rₓ gives;
=
------------------(i)
From the question;
Let
R₁ = resistance of first resistor = 40Ω
R₂ = resistance of second resistor = 60Ω
Now,
To get their combined or total resistance, Rₓ, substitute these values into equation (i) as follows;
=
=
= 24 Ω
Therefore, the total resistance is 24Ω
Answer:
24 ohms
Explanation:
pf
hope this helped :)
God bless you!!!!
Answer:
temperature of first extraction 330.8°C
temperature of second extraction 140.8°C
power output=3168Kw
Explanation:
Hello!
To solve this problem we must use the following steps.
1. We will call 1 the water vapor inlet, 2 the first extraction at 100kPa and 3 the second extraction at 200kPa
2. We use the continuity equation that states that the mass flow that enters must equal the two mass flows that leave
m1=m2+m3
As the problem says, 20% of the flow represents the first extraction for which 5 * 20% = 1kg / s
solving
5=1+m3
m3=4kg/s
3.
we find the enthalpies and temeperatures in each of the states, using thermodynamic tables
Through laboratory tests, thermodynamic tables were developed, these allow to know all the thermodynamic properties of a substance (entropy, enthalpy, pressure, specific volume, internal energy etc ..)
through prior knowledge of two other properties
4.we find the enthalpy and entropy of state 1 using pressure and temperature
h1=Enthalpy(Water;T=T1;P=P1)
h1=3457KJ/kg
s1=Entropy(Water;T=T1;P=P1)
s1=7.234KJ/kg
4.
remembering that it is a reversible process we find the enthalpy and the temperature in the first extraction with the pressure 1000 kPa and the entropy of state 1
h2=Enthalpy(Water;s=s1;P=P2)
h2=3116KJ/kg
T2=Temperature(Water;P=P2;s=s1)
T2=330.8°C
5.we find the enthalpy and the temperature in the second extraction with the pressure 200 kPav y the entropy of state 1
h3=Enthalpy(Water;s=s1;P=P3)
h3=2750KJ/kg
T3=Temperature(Water;P=P3;s=s1)
T3=140.8°C
6.
Finally, to find the power of the turbine, we must use the first law of thermodynamics that states that the energy that enters is the same that must come out.
For this case, the turbine uses a mass flow of 5kg / s until the first extraction, and then uses a mass flow of 4kg / s for the second extraction, taking into account the above we infer the following equation
W=m1(h1-h2)+m3(h2-h3)
W=5(3457-3116)+4(3116-2750)=3168Kw
Answer:
Explanation:
From the question we are told that:
Voltage
Power
Initial Power factor
Final Power factor
Generally the equation for Reactive Power is mathematically given by
Q=P(tan \theta_2-tan \theta_1)
Since
And
Therefore
Therefore
The size of the capacitor in vars that is necessary to raise the power factor to 0.9 lagging is
Answer:
101.42235 kPa
Explanation:
The unit inHg means "inches of mercury", Its a pressure unit commonly used by the US aviators.
The conversion value to KPa (kilopascal) is
1 inHg= 3.386389 kPa
So now we only have to multiply:
29.95 inHg * 3.386389 kPa/in Hg =101.42235 kPa
Have a nice day and Good Luck!
Answer:
The correct answer is: the following factors are needed to properly consider while selecting a brake or clutch:
-Engagement
-Friction
-Electromagnetic
-Mechanical
-Actuation
-Electric
-Fluid power
-Self-actuation
-Key concepts
-Application notes
-Selection criteria
Explanation:
Clutches and brakes are important devices in many rotating drive systems, it is very important to guarantee the security and the proper function of them accomplishing a high quality parameters in those factors.
In this exercise we have to use the knowledge of force to calculate the required energies, so we have to:
a) 19094 N
b) 110.055 kPa
c) 1222 J
In the field of physics, force is a physical action that causes deformation or that changes the state of rest or movement of a given object.
a) Knowing that the force formula is defined by:
b) Knowing that the force exerted by an area is equal to the pressure in that area, we have:
c)So calculating the potential energy we have:
See more about force at brainly.com/question/26115859
Answer:
a) 19094 N
b) 110.055 kPa
c) 1222 J
Explanation:
The force on the gas is the weight plus the atmospheric pressure multiplied by the piston area
F = P + p * A
F = m * g + p * π/4 * d^2
F = 150 * 9.813 + 101570 * π/4 * 0.47^2 = 19094 N
The pressure is the force divided by the area of the piston
p1 = F / A
p1 = F / (π/4 * d^2)
p1 = 19094 / (π/4 * 0.47^2) = 110055 Pa = 110.055 kPa
variation of gravitational potential energy is defined as
ΔEp = m * g * Δh
ΔEp = 150 * 9.813 * 0.83 = 1222 J