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For safety, when a train approaches a crossing it blows its whistle. If you were waiting at the crossing, you would notice that the pitch of the whistle becomes lower once the train has passed you. Explain why this is the case.
The wave function y(x, t) for a certain standing wave on a string fixed at both ends is given by y(x, t) = 3.70 sin (0.220x) cos (270t), What is the speed of transverse waves on this string
Obtain the quadratic equation and the explicit analytical solution for N which is valid at all temperatures below the intrinsic temperature.
The figure shows a rod of length H caused to move at constant speed V along horizontal conducting rails connected on one end by a resistor of resistance R. The magnetic field in which the rod moves is provided by a current I1 in a long parallel wi..
Two generators use the same magnetic field and operate at the same frequency. Find the coil radius r of this other generator
A person holds a 4-kg weight in each hand with arms outstretched while standing at rest on a lightweight platform that is free to turn about a vertical axis. Estimate the person's moment of inertia
The main components of a thermal/steam power plant are: Pump, boiler, steam turbine, condenser and generator. which one operates at higher temperature and pressure
An escalator is needed to carry 80 passengers per minute a vertical distance of 7.0 meter. Mass of each passenger is 65 kilogram. Determine the total amount of work
An ion experiences a magnetic force of 5.9*10-16 N when moving in the positive x direction but no magnetic force when moving in the positive y direction. What is the magnitude of the magnetic force exerted on the ion when it moves in the x-y plane al..
The length of a simple pendulum is 0.87 m and the mass of the particle (the "bob") at the end of the cable is 0.21 kg. What is the angular frequency of the motion
a computer disk drive spins at 7200 rpm when a brief 30 second power outage occurs. during this time the drive slows
The rotor in a certain electric motor is a flat, rectangular coil with 81 turns of wire and dimensions 2.57 cm by 4.32 cm. Find the maximum torque acting on the rotor
A coil has a DC resistance of 100 Ω and an impedance of 180 Ω at a frequency of 2 kHz. Neglect the wiring capacitance of the coil at this frequency. What is the inductance of the coil? Answer in units of mH.
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