1 A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear.
−4.5cm
−4.5cm
−5.5cm
−5.5cm
−6.5cm
−6.5cm
−7.5cm
−7.5cm
2 A wire of length L and cross-sectional area A has a resistivity ρ. Which of the following formulas can be used to calculate the resistance of the wire?
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ρ×LA
ρ×LA
ρ×AL
ρ×AL
Lρ×A
Lρ×A
No answer
3 The electric current as a function of voltage of a wire is presented by the attached graph.What is the resistance of the wire?
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1Ω
1.02Ω
1.6Ω
0.8Ω
1
Expert's answer
2016-08-22T04:40:22-0400
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