Chapter 2: Q 2-4 (page 81)
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A ball moves in the direction of the arrow labeledin Figure. The ball is struck by a stick that briefly exerts a force on the ball in the direction of the arrow labeled. Which arrow best describes the direction of, the change in the ball's momentum?
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 playground ride consists of a disk of mass and radius mounted on a low-friction axle (Figure 11.94). A child of mass runs at speed on a line tangential to the disk and jumps onto the outer edge of the disk.
(a.) If the disk was initially at rest, now how fast is it rotating? (b) What is the change in the kinetic energy of the child plus the disk? (c) where has most of this kinetic energy gone? (d) Calculate the change in linear momentum of the system consisting of the child plus the disk (but not including the axle), from just before to just after impact. What caused this change in the linear momentum? (e) The child on the disk walks inward on the disk and ends up standing at a new location a distance from the axle. Now what is the angular speed? (f) What is the change in the kinetic energy of the child plus the disk, from the beginning to the end of the walk on the disk? (g) What was the source of this increased kinetic energy?
In the circuit shown in Figure 19.77 the emf of the battery is . Resistor has a resistance of , resistor has a resistance of , and resistor localid="1662203602529" has a resistance of localid="1662203617219" . A steady current flows through the circuit.
(a)What is the equivalent resistance of and ? (b) What is the equivalent resistance of all three resistors? (c) What is the conventional current through
Question: An electron passes location , and later is detected at location , (1 microsecond is). a) What is the average velocity of the electron? b) If the electron continues to travel at this average velocity, where will it be in another ?
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