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3 years ago

FREE BRAINLIST NEED HELP ASAP

Mathematics

1 answer:

ArbitrLikvidat [17]3 years ago

3 0

Answer:

Step-by-step explanation:

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The heat developed in an electric wire varies jointly as the wires resistance, the time the current flows, & the square of t

never [62]

Answer:

4 ohms

Step-by-step explanation:

The question is "In two minutes a current of 5 amps develops 1,200 heat units in a wire of 8 ohms resistance. What resistance does a similar wire have, which develops 6,000 heat units with a current of 10 amps in 5 minutes?"

Current, I₁ = 5 A

Heat, Q₁ = 1200 units

Resistance, R₁ = 8 ohms

Time, t₁ = 2 min = 120 s

New heat, Q₂ = 6000 units

Current, I₂ = 10 A

New time, t₂ = 5 min = 300 s

We need to find the new resistance.

Heat developed is given by :

$Q=I^2Rt$

$\dfrac{Q_1}{I_1^2R_1t_1}=\dfrac{Q_2}{I_2^2R_2t_2}\\\\R_2=\dfrac{Q_2\times I_1^2R_1t_1}{Q_1I_2^2t_2}\\\\R_2=\dfrac{6000\times 5^2\times 8\times 120}{1200\times 10^2\times 300}\\\\=4\ \Omega$

So, the new resistance is 4 ohms.

5 0

3 years ago

Jose earns extra money, m, working two weekends with his dad. He is saving to buy a new pair of skis that cost $147. Fantasia sa

Olegator [25]

Answer:

where is her work?

Step-by-step explanation:

maybe you forgot to put the pic

6 0

2 years ago

I NEED HELP THIS IS LATE

slamgirl [31]

Answer:

M=-10

Step-by-step explanation:

To find the sope we use y-y1/x-x1. For this problem, I chose the first two coordinates.

(-33.5)-(-55.6)/1.20-3.45=22.6/-2.25=-10(rounded)

hope this helps!:)

6 0

3 years ago

I really need help please :))))))

Lelechka [254]

Answer:

If there were 25% fewer sunny days this year, then the answer would be 75%. This is because there are(100-25)% of the sunny days this year compared to last year.

Let me know if this helps!

5 0

3 years ago

Please answer this also I need help

yKpoI14uk [10]

Answer: 2/2

Step-by-step explanation:

6 x 2/2 =6

7 0

3 years ago