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VashaNatasha [74]

3 years ago

12

. In the following three arrangements each resistor has the same resistance R. Rank the equivalent resistances of the arrangemen

ts in descending order (largest first) 15. The peak value of the ac current in a circuit is 6.0 A, and peak value of the ac voltage applied to the circuit is 4.1 V. What is the average power delivered to the circuit? 16. The temperature coefficient of resistivity or a material is 0.0035 (C^o)^-1. By how much AT does the temperature of a wire made from this material have to change, in order that the resistance of the wire doubles?

1 answer:

Natali5045456 [20]3 years ago

6 0

Answer:

Explanation:

15 ) Current_rms = Peak current / √2

= 6 / √2

= 4.24 A

Voltage_rms = 4.1 / √2

= 2.9 v

Average power = Voltage_rms x Current_rms

= 2.9 x 4.24

= 12.3 W

16 ) R₂ = 2R₁

Resistance of a material changes due to change in resistivity of material .

So resistivity ρ₂ will also be twice resistivity ρ₁

ρ₂ = 2ρ₁

2ρ₁ = ρ₁ ( 1 + .0035 t ) where t is rise in temperature.

1 = .0035 t

t = 1 / .0035

= 285.7 ⁰ C

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Answer:

(a) convex mirror

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The having mirror is convex mirror.

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Use the formula of magnification.

$m =-\frac{v}{u}\\1.4=-\frac{v}{-20}\\v =28 cm$

Use the mirror equation, let the focal length is f.

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3 years ago

A speeder passes a parked police car at a constant speed of 23.3 m/s. At that instant, the police car starts from rest with a un

KonstantinChe [14]

Answer:

32s

Explanation:

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The second solution will be:

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Answer:

Explanation:

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3 years ago

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Explanation:

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3 years ago