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
Slav-nsk [51]
4 years ago
11

A cubical picnic chest of length 0.5 m, constructed of sheet styrofoam of thickness 0.025 m, contains ice at 0\[Degree]C. The th

ermal conductivity of the styrofoam is 0.035 W/(m K) and the ambient temperature is 25 \[Degree]C. If the resistances to convective heat flow are negligible, calculate the rate at which the ice in the chest melts in units of kg/hour. The latent heat of melting of ice is 3.34 10^5 J/kg.
Engineering
1 answer:
maksim [4K]4 years ago
6 0

Answer:

Rate of heat transfer is 0.56592 kg/hour

Explanation:

Q = kA(T2 - T1)/t

Q is rate of heat transfer in Watts or Joules per second

k is thermal conductivity of the styrofoam = 0.035 W/(mK)

A is area of the cubical picnic chest = 6L^2 = 6(0.5)^2 = 6×0.25 = 1.5 m^2

T1 is initial temperature of ice = 0 °C = 0+273 = 273 K

T2 is temperature of the styrofoam = 25 °C = 25+273 = 298 K

t is thickness of styrofoam = 0.025 m

Q = 0.035×1.5(298-273)/0.025 = 1.3125/0.025 = 52.5 W = 52.5 J/s

Mass flow rate = rate of heat transfer ÷ latent heat of melting of ice = 52.5 J/s ÷ 3.34×10^ 5 J/kg = 1.572×10^-4 kg/s = 1.572×10^-4 kg/s × 3600 s/1 hr = 0.56592 kg/hr

You might be interested in
Can someone help me on my auto tech worksheet
Mekhanik [1.2K]

Answer:

yes

Explanation:

3 0
3 years ago
What CAR would you buy if you had 100,000,000 million dollars ​
cluponka [151]

Answer:

A toy car and with the rest of the money buy big house.

7 0
3 years ago
Read 2 more answers
What is meant by the dead state. Discuss its significance.
Jlenok [28]

Answer and Explanation:

Dead state can be defined as the state in which both the are ambient properties and the system properties are coincident to each other.

Since the surroundings are similar and these surroundings are fixed also, there will be no kinetic energy and also the gravitational potential energy for both the systems is also equal.

Practically, in thermodynamic studies, the Gravitational potential energy of the system is negligible. This state holds significance because it leads to the termination of all the processes that are spontaneous in nature.

4 0
4 years ago
The graph to the right shows the amount of acres burned by wildfires in the 11 western states of the United States between 1916
qaws [65]

Answer:

it goes low to high off and on

Explanation:

because i wrote it

4 0
3 years ago
Print "userNum1 is negative." if userNum1 is less than 0. End with newline. Assign userNum2 with 2 if userNum2 is greater than 1
miv72 [106K]

Answer:

From the question, we have two variables

1. userNum1

2. userNum2

And we are to print "userNum1 is negative" if userNum1 is less than 0.

Then Assign userNum2 with 2 if userNum2 is greater than 10.

Otherwise, print "userNum2 is less or equal 10.".

// Program is written in C++ Programming Language

// Comments are used for explanatory purpose

// Program starts here

#include<iostream>

using namespace std;

int main ()

{

// Declare variables

int userNum1, userNum2;

// Accept input for these variables

cin>>userNum1, userNum2;

// Condition 1

if(userNum1 < 0)

{

cout<<"userNum1 is negative"<<'\n';

}

// Condition 2

if(userNum2 > 10)

{

userNum2 = 2;

}

// If condition is less than 10

else

{

cout<<"userNum2 is less or equal to 10"<<\n;

}

return 0;

}

// End of Program.

3 0
3 years ago
Other questions:
  • Race conditions are possible in many computer systems. Consider an online auction system where the current highest bid for each
    10·1 answer
  • Heats of Reaction and Hess's Law experiment tells you to look up three values. Write down these values. Be sure to clearly indic
    15·1 answer
  • If the contact surface between the 20-kg block and the ground is smooth, determine the power of force F when t = 4 s. Initially,
    14·1 answer
  • The efficiency of an electric motor is 80%. If it supplies 6 kW of rotational output power, calculate the amount of electrical i
    8·1 answer
  • Explain the process of fractional distillation (include cracking)
    11·1 answer
  • Convert 850 nm wavelength into frequency, eV, wavenumber, joules and ergs.
    11·1 answer
  • Select the correct answer.
    15·2 answers
  • Who else ships it????????
    6·1 answer
  • Estimating is important in construction industry because
    15·1 answer
  • What is placed as the first step in the scientific method?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!