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Lisa [10]
3 years ago
7

How do I do number 12

Mathematics
1 answer:
uysha [10]3 years ago
5 0

Answer:

d = √(k/R)

Step-by-step explanation:

Eliminate fractions by multiplying by the denominator, then divide by the coefficient of d². Finally, take the square root.

R=\dfrac{k}{d^2}\\\\Rd^2=k \quad\text{multiply by $d^2$}\\\\d^2=\dfrac{k}{R} \quad\text{divide by $R$}\\\\d=\sqrt{\dfrac{k}{R}} \quad\text{take the square root}

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A 1 km long train travelling at a speed of 60km/h enter a tunnel 1km long. What time will the train take to come out of the tunn
zysi [14]

Answer:

2 minutes

Step-by-step explanation:

The front of the train enters the tunnel and travels 1 km before the rear of the train enters the tunnel.  Thus, the total distance traveled by the front of the train is 2 km, and this is covered in a certain number of hours:

Since distance = rate times time, time = distance / rate.  In this particular case we have:

                                              2 km

time = distance / rate = ------------------- = (1/30) hr

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(1/30) hr converts to 2 minutes, since 1 hr = 60 minutes

3 0
2 years ago
A person can pay 18$ for a membership at a museum and then go for just 1$ per visit. What is the maximum number of visits a memb
Studentka2010 [4]
<h3>Answer: 32</h3>

==================================================

Work Shown:

Let

x = number of visits

y = total cost in dollars

The membership costs $18 no matter how many visits you do. If you make x visits, at $1 each, then it costs an additional 1*x = 1x = x dollars. This is added on top of the base membership fee. In total, we know that y = 18+x = x+18

We want the total y to be at most $50. Therefore y \le 50. The highest y can get is 50.

Let's replace y with x+18 and isolate x

y \le 50

x+18 \le 50 y is replaced with x+18

x+18-18 \le 50-18 subtract 18 from both sides

x \le 32

This tells us that we can make at most 32 visits. In other words, the maximum number of visits is 32.

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Read 2 more answers
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