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Problem 1: A calibration equation for a temperature sensor calibrated for 100 ≤ T ≤ 500K is give as R = 1.25 - 0.03T + 5 * 10-4T2 + 1 * 10-6T3 (with R in Ω and T in K). Determine the sensitivity of the temperature sensor at T = 300 K.
Problem 2: What type of strain gauge should be used for an application where the axes of the principal stresses are unknown?
Problem 3: For pipe flow, the Reynolds number for the flow is given as Re = ρVD/µ. In an experiment using water (ρ = 1000kg/m3), the following results were measured:
D = 0.5 ± 0.05mm, V = 10 ± 0.05 m/s, µ = 0.001 ± 5 * 10-6 Pa.s.
a. Calculate the value of the Reynolds number (Re) and its uncertainty.
b. Which of the three measured results contributed the most to the uncertainty of Re?
c. If one could only reduce the uncertainty of one of the three measured results, which one should be reduced in order to minimize the uncertainty of Re?
A waste heat source is available at 400°C. A heat engine operates using heat from this source. It rejects heat to the surroundings at 38°C. The power from the engine runs an air conditioner to keep the air inside a building at 25°C
Consider a small town in the Phillippines, where the average weight of people is 55 kg, and the average lifespan is 60 years. The people here eat lots of fish due to abundant availability from the local river.
A motorcyclist travels around a curved path that has a radius of 200 . While traveling around the curved path, the motorcyclist increases speed by 1.25 . a) If the motorcyclist starts from rest, determine the time needed to reach an acceleration of 5..
For a cross section of a slope through a jointed rock mass, draw the approximate positions of the water table for the following conditions. (K = relative permeability)
A horizontal het of water at 5 degrees celsius strikes a block and is deflected upward 30 degrees. The mass flow rate of the water is 1.75 kg/s. The mass of the block is 1.30 kg. The jet has a cross sectional area of 10 cm^2
A four year financial project has net cash flows of $20,000; $25,000; $30,000; and $50,000 in the next four years. It will cost $75,000 to implement the project. If required rate of return is 20%, conduct a discounted cashflow calculation
rom a photograph one observes that on a level section of highway 10% of the vehicles are trucks, 90% are cars, and that there are 50 vehicles per mile of highway. The trucks travel at 40 mph, and the cars at 50 mph.
The L bracket shown below is pinned to the ground at point C and attached to a single cable at points A and D that wraps around a frictionless pulley at point B. Determine the forces acting on the bracket at point C and then tension in the cable.
Design a spreadsheet to estimate the dimensions of a tank for holding water. The spreadsheet should use input values from the user to return the height and diameter for a tank that will use the smallest amount of steel and therefore cost the least to..
Discuss sources of water that are useful or potentially useful and discuss surface and groundwater.
A projectile is fired into a block of wood that is hanging on the end of a light rigid rod. How you would estimate the speed of the projectile. What might account for the errors in your estimation.
A car traveling over a hill at constant speed starts to lose contact with the ground at O. If the radius of curvature of the hill is 85 m, determine the speed of the car at O.
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