1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ghella [55]
3 years ago
14

Newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its te

mperature and that of its surroundings. Suppose that the temperature of a cup of coffee obeys Newton's law of cooling. If the coffee has a temperature of 185 degrees Fahrenheit when freshly poured, and 3 minutes later has cooled to 172 degrees in a room at 78 degrees, determine when the coffee reaches a temperature of 147 degrees.
Physics
1 answer:
schepotkina [342]3 years ago
4 0

Answer:

6.77 minutes

Explanation:

172 degree - 78 degree = (185 degree - 78 degree)e−2 k

=> 94 = 107

e−2 k => 94 ÷ 107

k => ln (94÷107) / 2

147 - 78 = (185 - 78)e ^[ln (94÷107) / 2]

=> 69 = 107 e^ [ln (94÷107) / 2]

e^[ln (94÷107) / 2] =69 ÷ 107

=> t = [ln (69 ÷ 107)] ÷ [ln (94÷107) / 2]

t=> -0.4387 ÷ -0.0648

t => 6.77 minutes.

Therefore, the final answer to the question is 6.77 minutes.

You might be interested in
If you are given the mass of an object in pounds, the time in seconds, and the distance in feet, what must you do before you can
Alexandra [31]

Answer: First you must convert pound in kilogram, and feet in meter

Explanation:

To calculate momentum we use .

p=m*V

mass-m

speed-V

distance and time are used to calculate velocity(speed)

You are given :

 mass- in pounds

for distance - in feet

before you do any calculation first you have to convert pounds in kilograms

and feet in meters.

5 0
3 years ago
What type of stress is shown in the following diagram?
leva [86]
Here stress is parallel to the surface of the body. So it's a Shear stress.
7 0
3 years ago
Read 2 more answers
state and explain any effect on sensitivity of liquid in a glass thermometer (i) reducing the diameter of capillary tube​
Ad libitum [116K]

Answer:

please give me brainlist and follow

Explanation:

The measuring sensitivity of liquid-in-glass thermometers increases with the amount of liquid in the thermometer. The more liquid there is, the more liquid will expand and rise in the glass tube. For this reason, liquid thermometers have a reservoir to increase the amount of liquid in the thermometer.

4 0
3 years ago
Why does water’s high specific heat make it a good coolant for car radiators?.
Alexeev081 [22]

Answer:

Car radiators: Water is used as coolant car radiators. Due to its high specific heat capacity, it can absorb a large amount of heat energy from the engine of the car, but its temperature does not rise too high.

Explanation:

i hope this answer your question if it s wrong please let know

7 0
2 years ago
Read 2 more answers
A fluid is any substance that can flow and take the shape of its container A) true B) false
Tpy6a [65]
Its true...water takes the shape of its container and it flows..please give me 5 stars and brainliest

7 0
4 years ago
Read 2 more answers
Other questions:
  • Which changes will decrease the electric force between two positively charged objects? Check all that apply.
    13·2 answers
  • The current in a hair dryer measures 22 amps. The resistance of the hair dryer is 14 ohms what is the voltage
    12·1 answer
  • Compare and contrast an electric discharge with an electric current
    12·1 answer
  • Two tuning forks are played at the same time. One has a frequency of 490 Hz and the other is 488 Hz. How many beats per second a
    14·2 answers
  • A model rocket is launched straight upward with an initial speed of 52.0 m/s. It accelerates with a constant upward acceleration
    14·1 answer
  • . An unbalanced force of 500 N is applied to a 75 kg object. What is the acceleration of the object?
    14·1 answer
  • It wont let me make account i tried twice this the only way i hope i can get to you to tell you this.I also just picked a random
    7·2 answers
  • Which type of electromagnetic wave has the least energy?
    13·1 answer
  • A sample of cobalt-60 has an activity of 2000 Bq. What will the activity be after 10 years? Cobalt-60 has a half life of 5 years
    13·1 answer
  • Two cars are traveling in the same direction down a highway at 65 miles per hour. What is the relative velocity of the second ca
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!