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Calculating the Reynolds number.
find out Reynolds number if water at 15°C is flowing through a 3cm diameter pipe with a velocity of 50 cm-1. Is flow turbulent or laminar?
(At 15°C water has density of 999.1 kgm-3, and viscosity 1.14 x 10-3 Nsm-2)
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The position of an object moving along the x axis is given by x(t)=7.0t-3.0t^2 (with t in seconds, and x in meters). A) What is the average velocity during the time interval from t=0.0 s to t=2.0 s? B) What is the instan ...
The normal human ear can distinguish a difference in sound level of about 0.6 dB at a given frequency. What is the percentage of power increase required to raise the sound level 0.6 dB?
Calculate the induction generator's total internal current to feed the load specified in given Exercise, separating the self-exciting current to the capacitor and the current to the load itself. What is the active power ...
Using a graph like Figure 3.41, estimate to one decimal place the magnitude of the error in approximating sin x by x for -1 ≤ x ≤ 1. Is the approximation an over- or an underestimate?
Over the years, respected authorities have changed their minds several times concerning divorce and its impact on children. Based on your readings, discuss the literature that focuses on the effect divorce has on childre ...
At t = 0 a block with mass M = 5 kg moves with a velocity v = 2 m/s at position x o = -.33 m from the equilibrium position of the spring. The block is attached to a massless spring of spring constant k = 61.2 N/m and sl ...
Figure 3.50 shows the tangent line approximation to f(x) near x = a. (a) Find a, f(a), f'(a). (b) Estimate f(2.1) and f(1.98). Are these under- or overestimates? Which estimate would you expect to be more accurate and wh ...
Aircraft equipped with powerful radar units are forbidden from turning them on when on the ground near people. Explain why this is so.
1. How many intrinsic electrons and holes are there in a thermal de Broglie cube at 300K in Si corresponding to an energy equal to k B T? What is the thermal fluctuation in carrier density In this cube? Can the intrinsic ...
Two identical gas cylinders. One contains the diatomic gas nitrogen (N 2 ), and the other contains an equal mass of the diatomic gas oxygen (O 2 ). The pressures in the cylinders are the same, but the temperatures are di ...
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