Answer:
The question is incomplete, the complete question is:
Which of the following is not a reason to give yourself extra "cushion" when driving?
A. Poor visibility B. Poor road conditions C. Inclement weather D. None of these.
The correct answer is D. None of these.
Explanation:
All the options are not reasons to give yourself an extra cushion when driving, rather they are reasons that are not favorable to driving at all.
A cushion is a certain amount of distance you are supposed to keep between you and the car in front of you to allow easy maneuvering in any condition.
A typical cushion is 3 seconds between you and the car in front of you, in less than perfect conditions like bad weather or poor road conditions an additional second must be added to it.
Answer:
The answer is disc brake first evolved as a motorcycle braking system pattern just to become a smaller and remarkably lighter version of them.
Explanation:
- <u><em>It consisted of a metal disc called rotor and callipers that were attached to the fork or frame and equipped with pads to squeeze the rotor for braking.</em></u>
Answer: Current = 2A
Explanation:
Inductor L = 10mH
E.m.f = 1 V
Time t = 20 ms
Using
V = Ldi/dt
di/dt = V/ L
di/dt = 1/10×10^-3
di/dt = 100
di = 100dt
Integrate both sides
I = 100(t1 - to)
Assume that initially there is no current through the inductor.
to = 0
I = 100 × t
I = 100 × 20×10^-3
I = 2A
Answer:
the rate of heat loss from the steam turbine is Q = 200 kW
Explanation:
From the first law of thermodynamics applied to open systems
Q-W₀ = F*(ΔH + ΔK + ΔV)
where
Q= heat loss
W₀= power generated by the turbine
F= mass flow
ΔH = enthalpy change
ΔK = kinetic energy change
ΔV = potencial energy change
If we neglect the changes in potential and kinetic energy compared with the change in enthalpy , then
Q-W₀ = F*ΔH
Q = F*ΔH+ W₀
replacing values
Q = F*ΔH+ W₀ = 420 kg/min * (-600 kJ/kg) * 1 min/60 s * 1 MW/1000 kW + 4 MW = -0.2 MW = -200 kW (negative sign comes from outflow of energy)
Solution :
The treatment system will operate as the well mixed chamber.
Disinfection rate constant for the UV light, k is 7.80 /s. Number of bacteria in water need to be reduced by 99.9%
Percent reduction of bacteria should be 
Volume of the unit chamber is fixed at 2L
Assume the inlet concentration, 
as 1000
The outlet concentration of bacteria, C should be 
= 103
The well mixed chamber will then follow a completely mixed flow reactor model.
Compute the time required :
= 1.115 s
Flow through the system is 
= 1.79 L/s
The amount of water treated during the 10 hours of sunlight is 1.79 x 10 x 60 x 60 = 64440 L
