Natural gas is primarily used to make _______________ for agriculture
Fill in the blank(s) with the appropriate word(s).
fertilizer
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Technician A says aluminum oxide forms if the coolant becomes too diluted with water. Technician B says the thermostat on all engines remains closed until its predetermined opening point. Who is correct?
A. Technician A B. Technician B C. Both technicians D. Neither technician
If an evaporator has distributor tubes coming off the TEV distributor it is a ______________.
a. Flooded evaporator. b. Cap-tube evaporator. c. Multiple-circuit evaporator. d. Stamped evaporator.
Assume that µ=1.49 Pa•s and h=10 mm, both with negligible uncertainty.
In a Couette flow, two large flat plates lie one on top of another, separated by a thin layer of fluid. If a shear stress is applied to the top plate, the viscosity of the fluid produces motion in the bottom plate as well. The velocity V in the top plate relative to the bottom plate is given by V=?h/µ, where ? is the shear stress applied to the top plate, h is the thickness of the fluid layer, and µ is the viscosity of the fluid. a. Suppose that ?=30.0 ± 0.1 Pa. Estimate V, and find the uncertainty in the estimate. b. If it is desired to estimate V with an uncertainty of 0.2 mm/s, what must be the uncertainty in ??
One problem with causal filters is that the response of the filter always lags the excitation. This problem cannot be eliminated if the filtering is done in real time but if the signal is recorded for later “off-line” filtering one simple way of eliminating the lag effect is to filter the signal, record the response and then filter that recorded response with the same filter but playing the signal back through the system backward. Suppose the filter is a single-pole filter with a frequency response of the form 
where 
is the cutoff frequency (half-power frequency) of the filter.
(a) What is the effective frequency response of the entire process of filtering the signal forward, then backward? (b) What is the effective impulse response?