Question

In: Math

A metal rod at 38°C is placed in a room at a constant temperature of 0°C....

A metal rod at 38°C is placed in a room at a constant temperature of 0°C.


(a) If after 20 minutes the temperature of the rod is 20°C, find the temperature function T(t) that
models the temperature T of the rod at time t. Assume Newton's Law of Cooling.
Note: You must state the differential equation that models this situation and include
how to solve this DE as part of your solution.


(b)Determine the time it will take for the bar to reach 10°C.

(c)Determine the temperature of the metal rod after 15 minutes.

Solutions

Expert Solution


Related Solutions

100. mL of H2O is initially at room temperature (22.0∘C). A chilled steel rod at 2.0∘C...
100. mL of H2O is initially at room temperature (22.0∘C). A chilled steel rod at 2.0∘C is placed in the water. If the final temperature of the system is 21.1 ∘C, what is the mass of the steel bar? Specific heat of water = 4.18 J/g⋅∘C Specific heat of steel = 0.452 J/g⋅∘C Express your answer numerically, in grams, to one significant figure.
To what temperature (in °C) must a cylindrical rod of one metal 10.045 mm in diameter...
To what temperature (in °C) must a cylindrical rod of one metal 10.045 mm in diameter and a plate of second metal having a circular hole 9.990 mm in diameter have to be heated for the rod to just fit into the hole? Assume that the initial temperature is 25°C and that the linear expansion coefficient values for metals one and two are 4.9 x 10-6 (°C)-1 and 17 x 10-6 (°C)-1, respectively.
As the temperature of a metal rod varies, so does the resistance and the dimensions of...
As the temperature of a metal rod varies, so does the resistance and the dimensions of the rod. If a copper rod has a resistance of 4.78 Ω at 20.0°C, determine the resistance of the rod (in Ω) at 120°C by accounting for the changes in both the resistivity and the dimensions of the rod. The coefficient of linear expansion for copper is 1.67 ✕ 10−5 (°C)−1 and the temperature coefficient of resistivity is 4.04 ✕ 10−3 (°C)−1.
If an aluminum oxide at room temperature (25°C) is placed on hot oven where it's surface...
If an aluminum oxide at room temperature (25°C) is placed on hot oven where it's surface is heated to 100°C at time t=0, how long would it take for the material to reach 80°C, 1 mm from the surface? Thermal diffusivity of the aluminum oxide is 11 cm²/s. The answer should be in milliseconds. Hint: Apply the Fick's second law. SUBMIT YOUR SOLUTION! material science course
PART A) A sample of metal at a known hot temperature is placed in to a...
PART A) A sample of metal at a known hot temperature is placed in to a calorimeter containing water of known mass and known initial temperature. The temperature of the water rises and the final temperature of the water is recorded. What equation is used to calculate the amount of heat the calorimeter water absorbed? PART B) How do you deermine the amount of heat lost by the metal if you know the amount of heat gained by the calorimeter...
1. A 48.0−g sample of an unknown metal at 99°C was placed in a constant-pressure calorimeter...
1. A 48.0−g sample of an unknown metal at 99°C was placed in a constant-pressure calorimeter containing 70.0 g of water at 24.0°C. The final temperature of the system was found to be 28.4°C. Calculate the specific heat of the metal. (The heat capacity of the calorimeter is 10.4 J/°C.) 2.A balloon 19.0 m in diameter is inflated with helium at 23°C. Calculate the work done (in kJ) during the inflation process if the atmospheric pressure is 97.7 kPa. 3.Ice...
A metal bar, initially at 2000K, is placed in a large tank of water at room...
A metal bar, initially at 2000K, is placed in a large tank of water at room temperature. Tank is well isolated from the environment. Between the moment bar was placed in the water and the moment when bar and water reached equilibrium, did the entropy of the metal bar increased, decreased, or remained the same? Explain.
If the temperature inside a room is 25°C and the temperature outside is ?10°C: a. What...
If the temperature inside a room is 25°C and the temperature outside is ?10°C: a. What is the maximum relative humidity that can be accommodated inside the room before the window fogs over? (Assume the inside of the window is not insulated from the outside temperature). b. If it is a double-pane window such that the inside of the window is perfectly insulated from the outside, what will the maximum relative humidity be?
. [4 pts] The temperature of a 4 foot metal rod at a point x feet...
. [4 pts] The temperature of a 4 foot metal rod at a point x feet from its left endpoint is given by T(x) = 1 + 3x 2 , 0 ≤ x ≤ 4, where T is measured in degrees Celsius (and x is measured in feet). Find the average temperature of the rod. 5. [6 pts] A particle moves along a coordinate line and has an acceleration given by a(t) = 4t+ 6 cm/sec2 . If the particle’s...
The temperature of a metal ingot is 55C above room temperature right now. Twenty minutes ago,...
The temperature of a metal ingot is 55C above room temperature right now. Twenty minutes ago, it was 65C above room temperature. a. How far above room temperature will the ingot be 20minutes from now? b. How far above room temperature will the ingot be 2 hours from now? c. When will the ingot be 10C above room temperature?
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT