Can some help me with all of these questions? resistance after the stretch by R
ID: 2040234 • Letter: C
Question
Can some help me with all of these questions?resistance after the stretch by R 3. to the left 4. toward the wire 5. into the page The ratiois ? Question 5, chap 128, sect i part lof10 points A length of wire is cut into 4 ecin pieces. 3. The 4 pieces are then connected paralle, withi the resulting resistance being 6 9 What was the resistance r of the origina. length of wire? 4,? 4. 96 2 5. 100 Question 8, chap 127, sect 9. part 1of 10 points A calculator is rated at 0.62 W when con Question 6, chap 127, sect 3. part 1 o2 0 poists pectod to 0.920 V buttery What is the resistauce of this device? 1. 1.28212 9 2. 1.323 2 ?130516 12 4. 1 14027 5. 1.55314 ? suppose that a mitorm wire of resistuco is stretcheci uaiformly to N lisnes its origiaa ength Assume the total volume of the wice ro mains the sane, and the volume is given by the produet of the cross seetionai area and te length. Denote the originel area by A and he Question 9, chap 129, sect 1. part 1 of 10 polnts ares after the stretch bby A The catto B thnt is diveeterd out of the plane of the pagse 15 shewn 0 When the electros is moving in the plane of the pase in the direetion indicated by the wrrow. the force on the electron s directed Question T, chap 127, sect 3 part 2of2 10 polnts 1, toward the top of the page Denote the original resistance boy iR at the 2. tuward the bottom of the pag
Explanation / Answer
5. R = rho L / A
after cutting in 4 pieces, R' = R/4
when connected in paralle,
1/Req = 1/R' + 1/R' + 1/R' + 1/R' = 4 / R'
1/6 = 4 / R'
R' = 24 ohm
and R = 4 R' = 96 ohm Ans(4)
6. V = A L = A' L'
A' / A = L / L' = 1/N
Ans(5)
7. R = rho L / A So R A / L = R' A' / L'
R (A / A') (L'/ L) = R'
R' / R = N^2
Ans(4)
8. P = V^2 / R
0.62 = 0.920^2 / R
R = 1.36516 Ohm Ans(3)
9. Fb = q ( v X B) = (-1) (x^ x z^) = - (- y^)
Fb = y^
Ans: toward the top of page