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Chapter 2: Q2-9P (page 82)
Question: A truck driver slams on the brakes and the momentum of the truck changes fromtoindue 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.
The net force exerted on the truck by the surrounding isN
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Question: A solid plastic sphere of radius R has charge -Q distributed uniformly over its surface. It is far from all other objects.
(a). Sketch the molecular polarization in the interior of the sphere and explain briefly.
(b). Calculate the potential relative to infinity at the center of the sphere.
A thin diverging lens of focal length 25cm is placed 18cm to the right of a point source of blue light on the axis of the lens. Where is the image of the source? Is it a real or a virtual image? If you placed a sheet of paper at the location of the image, what would you see on the paper?
Here are questions about human diet. (a) A typical candy bar provides 280 calories (one 鈥渇ood鈥� or 鈥渓arge鈥� calorie is equal to ). How many candy bars would you have to eat to replace the chemical energy you expend doing 100 sit-ups? Explain your work, including any approximations or assumptions you make. (In a sit-up, you go from lying on your back to sitting up.) (b) How many days of a diet of 2000 large calories are equivalent to the gravitational energy difference for you between sea level and the top of Mount Everest, 8848 m above sea level? (However, the body is not anywhere near 100% efficient in converting chemical energy into change in altitude. Also note that this is in addition to your basal metabolism.)
Consider the three experiments described in Problem 30. Figure 2.58 displays four graphs of Fnet, x, the x component of the net force acting on the cart, vs. time. The graphs start when the cart is at rest, and end when the cart is again at rest. Match the experiment with the graph
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?
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