Physics, 24.06.2019 18:50 Squara

(1 point) newton's law of cooling states that the temperature of an object changes at a rate proportional to the difference between its temperature and that of its surroundings. suppose that the temperature of a cup of coffee obeys newton's law of cooling. let k> 0k> 0 be the constant of proportionality. assume the coffee has a temperature of 190 degrees fahrenheit when freshly poured, and 33 minutes later has cooled to 180 degrees in a room at 68 degrees.(a) write an initial value problem for the temperature t of the coffee, in fahrenheit, at time t in minutes. your answer will contain the uknown constant k : dtdt=equation editort(0)=equation editor(b) solve the initial value problem in part (a). your answer will contain the unknown constant k .t(t)=equation editor(c) determine the value of the constant kk=equation editorminutes.(d) determine when the coffee reaches a temperature of 150 degrees. equation editorminutes.

Answers: 3

Show answers

Another question on Physics

Physics, 21.06.2019 23:00

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Answers: 2

Answer

Physics, 22.06.2019 03:00

Isla’s change in velocity is 30 m/s, and hazel has the same change in velocity. which best explains why they would have different accelerations? isla had negative acceleration, and hazel had positive. isla had a different time than hazel. isla had positive acceleration, and hazel had negative. isla went a farther distance than hazel.

Answers: 1

Answer

Physics, 22.06.2019 03:50

Aspecimen of oil having an initial volume of 580cm^3 is subjected to a pressure increase of 4.0 mpa, and the volume is found to decrease by 0.40 cm^3. (a) what is the bulk modulus of the material? (b) what is the compressibility of the material?

Answers: 1

Answer

Physics, 23.06.2019 02:00

How does the strength of the electrostatic force between an electron and a proton compare to the strength of the gravitational force between them?

Answers: 1

Answer

You know the right answer?

(1 point) newton's law of cooling states that the temperature of an object changes at a rate proport...

Questions