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A student builds a simple axial flow-ventilating fan driven by a motor to provide some relief during summer. The motor delivers 0.4 kW of power to the fan blades. She observes the fan produces an outlet stream of air with a diameter of 0.6 m having a speed of 12 m/s. Assume that the flow upstream of the fan has negligible speed. Assume density of air to be 1.23 kg/m3 and room temperature to be 20o C. Assume all losses are due to friction (heat).
[a] Determine how much power from the motor produces useful effects (for the student).
[b] Estimate the mechanical efficiency of this fan.
The drawing shows an intravenous feeding. With the distance shown, nutrient solution (? = 1010 kg/m3) can just barely enter the blood in the vein. What is the gauge pressure of the venous blood
When a firecracker is placed inside a bowling ball, the momentum before the explosion is equal to the momentum after the explosion because
An LCR circuit contains a resistor 306 ohms, a capacitor 8.2 μF a and an inductance 1.1 mH. The circuit has a frequency of 100 Hz. Calculate the impedance in ohms to 2 s.f.
The magnetic field perpendicular to a circular wire loop 15.0 cm in diameter is changed from +0.43 T to -0.47 T in 300 ms , where + means the field points away from an observer and - toward the observer.
A runner runs 3.0 km, in a straight line, in 9.0 min and then takes 25 min to walk back to the starting point. What is the average speed for the whole trip
question1the overall gain of an stm controller is 10000x equivalent to40db where db10log10 at low frequencies. if piezo
To focus a camera on objects at different distances, the converging lens is moved toward or away from the film, therefore a sharp image always falls on the film. Find over what distance must the lens be movable
Imagine that, by some process, 5 bins are removed from the system. Calculate the new C, Tand the change in entropy for this process. Set k=1 for this problem.
in rutherfords famous scattering experiments that led to the planetary model of the atom alpha particles having charges
An iron wire has a resistance of 0.20ohms at 20°C and a resistance of 0.30ohms at 110°C. Find the temperature coefficient of resistance of the iron used in the wire.
A 8500-kg boxcar traveling at 13m/s strikes a second boxcar at rest. what is the mass of the second car
A block starts from rest at the top of a 16 degree inclined plane and encounters a spring, of constant 6.2 kN/m, rigidly attached to the plane. obtain the distance the block travelled before it encountered the spring
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