A 1.3 kg toaster is not plugged in. The coefficient ofstatic friction between the toaster and a horizontal countertop is 0.35. To make the toaster sta

FizeauV 2021-04-20 Answered
A 1.3 kg toaster is not plugged in. The coefficient ofstatic friction between the toaster and a horizontal countertop is 0.35. To make the toaster start moving, you carelesslypull on its electric cord.
PART A: For the cord tension to beas small as possible, you should pull at what angle above thehorizontal?
PART B: With this angle, how largemust the tension be?
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Expert Answer

Viktor Wiley
Answered 2021-04-22 Author has 84 answers
F cos x = u.m.g then
F=umgcosx=(0.35)(1.3)9.8cosx
F=4.46cosx
a. taking differential of this we have :
F=0(cosx)(4.46)sinxcos2x=4.46sinxcos2x
taken its stationary we'll have
F=4.46sinxcos2x=0sinx=0x=0o
b. F=4.46cos0=4.461=4.46N
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