Question

ДАЮ 20 БАЛЛОВ! Елочная свеча длиной 10 см сгорает за 1,5 часа. Какова скорость уменьшения длины горящей свечи? (напишите формулу и ответ) Аня зажгла елочную свечу длиной 5,5 см. Сколько времени будет гореть свеча? (напишите формулу и ответ)

Answer 1

Ответ:

1. s = 10 см

t = 1,5 ч.

V - ?

V= s:t

V= 10 см :1,5 ч ≈7 см/ч

2. s = 5,5 см

v = 7 см/ч

t-?

t= s:v

t= 5,5см : 7 см/ч ≈ 0,8 ч

0,8 ч = 48 мин

Пошаговое объяснение:

Answer 2

Calculation of the Rate of Decrease in Length of the Burning Candle:

To calculate the rate of decrease in length of the burning candle, we can use the formula:

Rate of decrease in length = Length of the candle / Burning time

Given that the length of the candle is 10 cm and the burning time is 1.5 hours, we can substitute these values into the formula:

Rate of decrease in length = 10 cm / 1.5 hours

To simplify the units, we need to convert the burning time from hours to minutes, as the length of the candle is given in centimeters. There are 60 minutes in an hour, so the burning time in minutes is:

Burning time in minutes = 1.5 hours * 60 minutes/hour = 90 minutes

Now we can substitute the values into the formula:

Rate of decrease in length = 10 cm / 90 minutes

Calculating this, we find that the rate of decrease in length of the burning candle is approximately 0.111 cm/minute.

Calculation of the Burning Time for a Candle with a Length of 5.5 cm:

To calculate the burning time for a candle with a length of 5.5 cm, we can use the formula:

Burning time = Length of the candle / Rate of decrease in length

Given that the length of the candle is 5.5 cm and the rate of decrease in length is 0.111 cm/minute (as calculated above), we can substitute these values into the formula:

Burning time = 5.5 cm / 0.111 cm/minute

Calculating this, we find that the burning time for a candle with a length of 5.5 cm is approximately 49.55 minutes.

Therefore, the candle will burn for approximately 49.55 minutes.

Please note that these calculations are based on the given information and assumptions about the burning characteristics of the candle. The actual burning time may vary depending on factors such as the composition of the candle and the conditions in which it is burned.