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ss7ja [257]
3 years ago
7

The heat generated by a stove element varies directly as the square of the voltage and inversely as the resistance. If the volta

ge increases by a factor of 10​, what needs to be done to quadruple the amount of heat​ generated?
Physics
1 answer:
madam [21]3 years ago
3 0

Answer:

The resistance needs to be increased by a factor of 25 to quadruple the amount of heat generated

Explanation:

Let H be the heat generated by the stove element, V its voltage and R its resistance.

So, H ∝ V²/R

H = kV²/R

HR/V² = k

H₁R₁/V₁² = H₂R₂/V₂²

If H₂ = 4H₁ and V₂ = 10V₁

H₁R₁/V₁² = 4H₁R₂/(10V₁)²

H₁R₁/V₁² = 4H₁R₂/100V₁²

R₁ = R₂/25

R₂ = 25R₁

The resistance needs to be increased by a factor of 25 to quadruple the amount of heat generated.

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Two cars travel westward along a straight highway, one at a constant velocity of 85 km/h, and the other at a constant velocity o
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To solve letter a:

d1 = 85t1 = 16 km, 
85t1 = 16, 
t1 = 16 / 85 = 0.1882 h = 11.29 min. 

d2 = 115t2 = 16 km, 
115t2 = 16, 
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t1 - t2 = 11.29 - 8.35 = 2.94 min. 
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To solve letter b:

15 min = 1/4 h = 0.25 h. 
d1 = d2, 
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30t = 21.25, 
t = 21.25 / 30 = 0.71 h, 

d = 115 * 0.71 = 81.65 km.

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2 years ago
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Answer:yes

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the meteorites which are most useful for the determination of the age of the solar system are the primitive meteorites. they consist light of colored or grey silicates mixed with metallic grains. the parent bodies of these meteorites are also mostly believed to be pieces asteriods left after they formed in the solar system.

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