Figure 18-59 shows a composite bar of length L = l 1 + l 2 and consisting of two materials. One material has length L 1 and coefficient of linear expansion α 1 ; the other has length L 2 and coefficient of linear expansion α 2 . (a) What is the coefficient of linear expansion α for the composite bar? For a particular composite bar, L is 52.4 cm, material 1 is steel, and material 2 is brass. If α = 1.3 × 10 −5 /C°, what are the lengths (b) L 1 and (c) L 2 ? Figure 18-59 Problem 96.
Figure 18-59 shows a composite bar of length L = l 1 + l 2 and consisting of two materials. One material has length L 1 and coefficient of linear expansion α 1 ; the other has length L 2 and coefficient of linear expansion α 2 . (a) What is the coefficient of linear expansion α for the composite bar? For a particular composite bar, L is 52.4 cm, material 1 is steel, and material 2 is brass. If α = 1.3 × 10 −5 /C°, what are the lengths (b) L 1 and (c) L 2 ? Figure 18-59 Problem 96.
Figure 18-59 shows a composite bar of length L
=
l1 +
l
2 and consisting of two materials. One material has length L1 and coefficient of linear expansion α1; the other has length L2 and coefficient of linear expansion α2. (a) What is the coefficient of linear expansion α for the composite bar? For a particular composite bar, L is 52.4 cm, material 1 is steel, and material 2 is brass. If α = 1.3 × 10−5/C°, what are the lengths (b) L1 and (c) L2?
Part A
Find the x-component of the electric field at the origin, point O.
Express your answer in newtons per coulomb to three significant figures, keeping in mind that an x component that points to the right is positive.
▸ View Available Hint(s)
Eoz =
Η ΑΣΦ
?
N/C
Submit
Part B
Now, assume that charge q2 is negative; q2 = -6 nC, as shown in (Figure 2). What is the x-component of the net electric field at the origin, point O?
Express your answer in newtons per coulomb to three significant figures, keeping in mind that an x component that points to the right is positive.
▸ View Available Hint(s)
Eoz=
Η ΑΣΦ
?
N/C
1. A charge of -25 μC is distributed uniformly throughout a spherical volume of radius 11.5 cm.
Determine the electric field due to this charge at a distance of (a) 2 cm, (b) 4.6 cm, and (c) 25 cm from
the center of the sphere.
(a) =
=
(b) E =
(c)Ẻ =
=
NC NC NC
1.
A long silver rod of radius 3.5 cm has a charge of -3.9
ис
on its surface. Here ŕ is a unit vector
ст
directed perpendicularly away from the axis of the rod as shown in the figure.
(a) Find the electric field at a point 5 cm from the center of the rod (an outside point).
E =
N
C
(b) Find the electric field at a point 1.8 cm from the center of the rod (an inside point)
E=0
Think & Prepare
N
C
1. Is there a symmetry in the charge distribution? What kind of symmetry?
2. The problem gives the charge per unit length 1. How do you figure out the surface charge density σ
from a?
Chapter 18 Solutions
Fundamentals of Physics Extended 10e Binder Ready Version + WileyPLUS Registration Card
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