Determine the number of boundary and initial conditions needed to solve the differential equation.
Two (2) boundary conditions needed
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A really high-speed train moves in a direction parallel to its length with a speed that approaches the speed of light. The length of the train, as measured by a stationary observer on the ground,
A) decreases due to the motion. B) increases due to the motion. C) is not affected by the motion. D) approaches infinity.
The figure shows two connected wires that are made of the same material. The current entering the wire on the left is 2.0 A and in that wire the electron drift speed is vd. What is the electron drift speed in the wire on the right side?
A) 4vd B) 2vd C) vd D) vd/2 E) vd/4
In a series RLC ac circuit, a second resistor is connected in series with the resistor previously in the circuit. As a result of this change, what happens to the impedance of the circuit?
A) It increases. B) It does not change. C) It increases for frequencies below resonance and decreases for frequencies above resonance. D) It decreases for frequencies below resonance and increases for frequencies above resonance. E) It decreases.
A supertrain (rest-length = 100 m) travels at a speed of 0.950 c as it passes through a tunnel (rest-length 50.0 m). As seen by a trackside observer, is the train ever completely within the tunnel? If so, by how much?