Problem 1. SAE 50 oil flows at a mass flowrate of 0.007 kg/s through a 1-cm I. D. tube that is 1.5 m long. The wall temperature is at 300 K and the inlet oil temperature is 377 K. Calculate: (1) The average heat transfer coefficient, (2) the oil temperature at the outlet, and (3) the convective heat loss from the oil.
1. Some bacteria are helpful to the body and:
a. cause cavities
b. die quickly outside other living cells
c. help the digestive system function properly
d. give you energy
2. Germs produce toxins in the body that can make you:
a. sneeze a lot
c. have diarrhea
d. all of the above
3.List three ways to keep germs from spreading.
4. Describe the proper way to wash hands.
5. Describe what the immune system does for the body.
6. An antigen:
a. is an unknown substance that infects the body
b. is a protein that attaches itself to germs to get rid of them
c. destroys germs in the body
d. is a type of immunity you are born with
7. True or false: Vaccinations help to provide us with adaptive immunity, which is immunity that develops as we are exposed to diseases. T F
8. White blood cells help to:
a. infect the body
b. provide passive immunity
c. destroy infections
d. weaken your immune system
9. A specialized protein that recognizes invaders to the body and attaches to them is called:
a. an antigen
b. an antibody
c. a complement
d. a T cell
10. True or false: It’s OK not to wash my hands after using the bathroom at home because it's cleaner than a public restroom. T F
A fan that can provide air speeds up to 45 m/s is to be used in a low-speed wind tunnel with atmospheric air at 25ºC. If one wishes to use the wind tunnel to study flatplate boundary layer behavior up to Reynolds numbers of Rex = 108, what is the minimum plate length that should be used? At what distance from the leading edge would transition occur if the critical Reynolds number were Rex, c= 5 x105?
The rotating element in a mixing chamber is given a periodic axial movement z = z0 sin 2πnt where z0 = 95 mm, and the frequency n = 2.7 s-1, while it is rotating at the constant angular velocity ω = 9.4 rad/s. determine the maximum magnitude of the acceleration of a point a on the rim of radius r = 112 mm.
A simple electric circuit is composed of a 1.5 V AAA battery and a 5.1 kΩ load. What is the circuit current? (Convert answer from micro Amps to mili A, 3 decimals – which way does the decimal move?) I already know the answer, just looking for a second opinion.
If you do not know what the equation for this it is; I =V/ R
PLEASE ONLY ANSWER THE QUESTION IF YOU KNOW IT
8. a wood chip fueled rankine cycle 54-mw electric power generation plant uses chipped pine bark beatle deadfall as fuel. the overall efficiency of the power plant is 27% and the capacity factor of 80%. the as-received wood fuel is 45% carbon, has a higher heating value of 16.0 mj/kg, and the wood is not harvested sustainably. carbon emissions are taxed at the rate of $25/mgco2e. the life of the system is 25 years and the interest rate is 5.5%. assume an operations and maintenance cost of $0.025/kwh. the initial cost of the system is $4000/kw. the cost of wood chips is $6 per mbtu. a. what is the heat rate of the power plant (btu/kwh)? b. what is the cost of fuel per kwh of electricity generated ($/kwh)? c. how much electrical energy is generated annually by the power plant (mwh/y)?
Vlf waves in the ocean. the electric field component of a uniform plane vlf (very low frequency) electromagnetic field propagating vertically down in the z-direction in the ocean (σ = 4 s/m, ∈r = 81, , μr = 1) is approximately given by e (z, t) = x^e0e^-az cos(6π x10^3t - βz), where e0 is the electric field amplitude at z = 0^+ immediately below the air-ocean interface, at z = 0. note that the frequency of the wave is 3 khz.
(a) find the attenuation constant α and phase constant β.
(b) find the wavelength λ, phase velocity vp, skin depth δ, and intrinsic impedance ηc, and compare them to their values in air.
(c) write the instantaneous expression for the corresponding magnetic field h (z, t).
You are a historian who is compiling information on the changing materials used in a product in one of the categories listed below. Choose a product that uses a variety of materials that have been discussed in this lesson (for example, a car or a tennis racket). Using online or library resources, research past materials used to create the product. Be sure to discuss the materials currently being used for the design and include information on the sustainability of these resources. Your research must also explain why the materials changes were made (for example, safety, cost, or weight). Keep track of your references so that you can document all of the resources used for your report.
Aswimming pool is 50 ft wide and 100 ft long and its bottom is an inclined plane, the shallow end having a depth of 4 ft and the deep end, 10 ft.
assume the pool is full of water. (round your answers to the nearest whole number. recall that the weight density of water is 62.5 lb/) estimate the hydrostatic force on the shallow end.(b) estimate the hydrostatic force on the deep end.(c) estimate the hydrostatic force on one of the sides.(d) estimate the hydrostatic force on the bottom of the pool.
Your engineering firm has been hired by the local electric company to construct them a wind farm on a square plot of 8567 hectares of land. the rotational diameter of the turbine blades is 50 meters. the distance between turbines from rotational diameter to rotational diameter in the same row must be 2500 feet and the distance between turbine rows must be 4000 feet in order for the turbines to operate at maximum efficiency. how many turbines will be in each row and how many rows of turbines will there be in total? remember, you can’t have a fraction of a turbine.