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Salsk061 [2.6K]

3 years ago

11

How many times as great as 10% is 100%?

2 answers:

monitta3 years ago

8 0

It is 10 times greater because

10x10=100

Aneli [31]3 years ago

4 0

10 times greater because 10 times 10

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d = r*t
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A small metal bar, whose initial temperature was 10° C, is dropped into a large container of boiling water. How long will it tak

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Answer

According to newton law of cooling

$\dfrac{d T}{dt} = k (T - T_a)$

and

$T = Ce^{kt} + T_a$

now At Ta = 100

T₀ = 10 °C

T₁ = 12° C

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C = -90

now,

$12 = -90e^k + 100$

$e^k = \dfrac{88}{90}$

$k = ln{\dfrac{88}{90}}$

at time equal to t

T(t) = 70

$T(t) = -90 (\dfrac{88}{90})^t + 100$

$70 = -90(\dfrac{88}{90})^t + 100$

$(\dfrac{88}{90})^t = \dfrac{1}{3}$

$t\times ln(\dfrac{88}{90}) = ln(\dfrac{1}{3})$

t = 48.88 s

hence, after 48.88 s the temperature of the body will be 70°C

b) time taken to reach 98°C

$T(t) = -90 (\dfrac{88}{90})^t + 100$

$98 = -90(\dfrac{88}{90})^t + 100$

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t = 390 s

hence, after 390 s the temperature of the body will be 98°C

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3 years ago

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Answer:

Explanation is in photo

Step-by-step explanation:

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3 years ago

What is the answer ????

forsale [732]

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51/3= 3k/3

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k= 17

Answer: k= 17

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3 years ago

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4.23cups/1liter = x cups/6liters

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Working out:
X=6x4.23
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