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Chapter 2: Q54P (page 45)
In Figure 19.76 the resistance is , is , and is . If this combination of resistors were to be replaced by a single resistor with an equivalent resistance, what should that resistance be?
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At a certain instant a particle is moving in the direction with momentum . During the next a constant force acts on the particle, with and . What is the magnitude of the momentum of the particle at the end of this interval?
Question: The following questions refer to the circuit shown in Figure 18.114, consisting of two flashlight batteries and two Nichrome wires of different lengths and different thicknesses as shown (corresponding roughly to your own thick and thin Nichrome wires).
The thin wire is 50 cm long, and its diameter is 0.25 mm. The thick wire is 15 cm long, and its diameter is 0.35 mm. (a) The emf of each flashlight battery is 1.5 V. Determine the steady-state electric field inside each Nichrome wire. Remember that in the steady state you must satisfy both the current node rule and energy conservation. These two principles give you two equations for the two unknown fields. (b) The electron mobility
in room-temperature Nichrome is about . Show that it takes an electron 36 min to drift through the two Nichrome wires from location B to location A. (c) On the other hand, about how long did it take to establish the steady state when the circuit was first assembled? Give a very approximate numerical answer, not a precise one. (d) There are about mobile electrons per cubic meter in Nichrome. How many electrons cross the junction between the two wires every second?
A comet passes near the Sun. When the comet is closest to the Sun, it is m from the Sun. You need to choose a time step to use in predicting the comet鈥檚 motion. Which of the following would be a reasonable distance for the comet to move in one time step, doing an iterative calculation by hand?
Question: A truck driver slams on the brakes and the momentum of the truck changes from toindue to a constant force of the road on the wheels of the truck. As a vector, write the net force exerted on the truck by the surroundings.
In a lab experiment you observe that a pendulum swings with a 鈥減eriod鈥� (time for one round trip) of . In an iterative calculation of the motion, which of the following would NOT be a reasonable choice for , for either hand or computer iterative calculations? a) b) c) d) .
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