Answer: 33.35 minutes
Explanation:
A(t) = A(o) *(.5)^[t/(t1/2)]....equ1
Where
A(t) = geiger count after time t = 100
A(o) = initial geiger count = 400
(t1/2) = the half life of decay
t = time between geiger count = 66.7 minutes
Sub into equ 1
100=400(.5)^[66.7/(t1/2)
Equ becomes
.25= (.5)^[66.7/(t1/2)]
Take log of both sides
Log 0.25 = [66.7/(t1/2)] * log 0.5
66.7/(t1/2) = 2
(t1/2) = (66.7/2 ) = 33.35 minutes
Answer:
Maximum shear stress is;
τ_max = 1427.12 psi
Explanation:
We are given;
Power = 2 HP = 2 × 746 Watts = 1492 W
Angular speed;ω = 450 rev/min = 450 × 2π/60 rad/s = 47.124 rad/s
Diameter;d = 1 in
We know that; power = shear stress × angular speed
So,
P = τω
τ = P/ω
τ = 1492/47.124
τ = 31.66 N.m
Converting this to lb.in, we have;
τ = 280.2146 lb.in
Maximum shear stress is given by the formula;
τ_max = (τ•d/2)/J
J is polar moment of inertia given by the formula; J = πd⁴/32
So,
τ_max = (τ•d/2)/(πd⁴/32)
This reduces to;
τ_max = (16τ)/(πd³)
Plugging in values;
τ_max = (16 × 280.2146)/((π×1³)
τ_max = 1427.12 psi
In the case above, poor connection at the pressure cycling switch and also a faulty A/C clutch coil could be the cause.
<h3>What is likely the reason when an A/C compressor will not engage if A/C is turned on?</h3>
The cause that hinders the A/C Compressor from engaging are:
- Due to low pressure lockout.
- Due to a poor ground
- Due to bad clutch coil.
- Dur to an opening in the wire that links to the clutch coil.
- Due to a blown fuse.
Note that the pressure switches is known to be one that control the on/off function of any kind of AC compressor and as such, if there is switch failure, it can hinder the AC compressor from functioning at all.
Therefore, technician A and B are correct.
Learn more about refrigerant pressure from
brainly.com/question/10054719
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The controller determines if a(n) error exists by calculating the difference between the SP and the PV.
<h3>How does a
controller work in control system?</h3>
The Control system is one where it entails if the output is one that has an effect on the input quantity.
So it uses the PV(Process Variable) set against the SP(Setpoint) to know if an error exists.
So, The controller determines if a(n) error exists by calculating the difference between the SP and the PV.
Learn more about controller from
brainly.com/question/14617664
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