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3 years ago

12

An aircraft is cruising at 720 km/h and covered 1000 km. How far would it travel in the same period of time is the speed increas

ed to 800 km/h

1 answer:

yanalaym [24]3 years ago

4 0

1000 km/h / 720 km/h = 1.39 hrs

800 km / hr * 1.39 hrs = 1112 km

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A bakery can make 640 bagels in 4 hours. How many can they bake in 16 hours.

lukranit [14]

Answer:

two ways

Step-by-step explanation:

there are two ways to do this

640/4 =160

take 160x16 = 2,560

OR

640x4 = 2,560

4 because 4x4 = 16

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2 years ago

Sonia walks to her aunt's house. She leaves home at 1025. She walks a total of 12km at an average speed of 5km/h. Work out the t

lisabon 2012 [21]

Answer: 1249 hrs

Step-by-step explanation:

Sophia walked for 12 km to get to her aunt's house.

She did this at a speed of 5km/h which means that the time taken was:

Time = Distance / Speed

= 12 / 5

= 2.4 hours

2.4 in hours:

= 0.4 * 60 minutes

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If she left at 1025, she would arrive at:

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3 years ago

Can someone help me with this math homework please!

andrew11 [14]

Answer:

I'm pretty sure it is 0.75

Step-by-step explanation:

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6 0

3 years ago

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(1 point) Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference betw

slavikrds [6]

Answer:

a. $\frac{dT}{dt}=k(T-Tm); T(0)=190$

b. $C_{0}=122$

c. $k=-0.00259$

d. $t=153.39838\\$ minutos

Step-by-step explanation:

a. Newton's law of cooling states that the speed with which a body is cooled is proportional to the difference between its temperature and that of the medium in which it is found. Then, the initial value problem is given by:

$Tm=68$

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$\frac{dT}{T-Tm}=kdt\\\\\int {\frac{dT}{T-Tm}}=\int{kdt}\\\\Ln|T-Tm|=kt+C\\\\T(t)=C_{0}e^{kt}+Tm=C_{0}e^{kt}+68\\\\T(0)=C_{0}e^{k(0)}+68=190\\\\C_{0}=122$

c. After 33 minutes of serving the coffee has cooled to 180°:

$T(33)=122e^{33k}+68=180\\\\e^{33k}=\frac{112}{122}\\\\33k=Ln(\frac{112}{122})\\\\k=-0.00259$

d.

$150=122e^{-0.00259t}+68\\\\Ln(\frac{150-68}{122})=-0.00259t\\\\t=153.39838\\\\$

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3 years ago

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aleksley [76]

Answer:

2 2

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Step-by-step explanation:

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3 years ago

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