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Musya8 [376]
3 years ago
8

Giving free brainlist first 1

Engineering
1 answer:
kaheart [24]3 years ago
8 0

Hi! Hope you're having a great day!

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a cubical box 20-cm on a side is contructed from 1.2 cm thick concrete panels. A 100-W light bulb is sealed inside the box. What
Flura [38]

Answer:

Temperature on the inside ofthe box

Explanation:

The power of the light bulb is the rate of heat conduction of the bulb, dq/dt = 100 W

The thickness of the wall, L = 1.2 cm = 0.012m

Length of the cube's side, x = 20cm = 0.2 m

The area of the cubical box, A = 6x²

A = 6 * 0.2² = 6 * 0.04

A = 0.24 m²

Temperature of the surrounding, T_0 = 20^0 C = 273 + 20 = 293 K

Temperature of the inside of the box, T_{in} = ?

Coefficient of thermal conductivity, k = 0.8 W/m-K

The formula for the rate of heat conduction is given by:

dq/dt = \frac{kA(T_{in} - T_0)}{L} \\\\100 = \frac{0.8*0.24(T_{in} - 293)}{0.012}\\\\T_{in} - 293 = \frac{100 * 0.012}{0.8*0.24} \\\\T_{in} - 293 = 6.25\\\\T_{in} = 293 + 6.25\\\\T_{in} = 299.25 K\\\\T_{in} = 299.25 - 273\\\\T_{in} = 26.25^0 C

5 0
4 years ago
What was the role of the rotors in the enigma machine?.
Lisa [10]

Answer:

Implements a reordering of the letters of the alphabet.

Explanation: GIVE ME 5 STARS AND a HEART!!!                                      Those contacts are wired across the rotor so that each contact on the left connects to the contact on the right in some scrambled arrangement. Each rotor, therefore, implements a reordering of the letters of the alphabet, which mathematicians call a permutation.

3 0
3 years ago
Ice slurry is being transported in a pipe (k = 15 W/m∙K, Di = 0.025 m, Do = 0.08 m, and L = 5 m) with an inner surface temperatu
grandymaker [24]

Answer:

Please see the attached file for complete answer.

Explanation:

Download pdf
3 0
4 years ago
Write a do-while loop that continues to prompt a user to enter a number less than 100, until the entered number is actually less
chubhunter [2.5K]

Answer:

#include <iostream>//including iostream library to use functions such as cout and cin

using namespace std;

int main() {

int userInput = 0;

do

{

 cout << "Enter a number < 100: " ;

 cin >> userInput;

 if (userInput < 100)//condition if number is less than 100

 {

  cout << "Your number < 100 is: " << userInput << endl;

 }

} while (userInput > 100);//do while loop condition

return 0;

}

Explanation:

A do-while loop executes regardless in the first iteration. Once it has run through the first iteration, it checks if the condition is being met. If, the condition is TRUE, the loop begins the second iteration. If FALSE, the loop exits. In this case, the condition is the userInput. after the first iteration, lets say the userInput is 120, the condition userInput > 100 is true.Therefore, the loop will run again until eventually the number is less than hundred, lets say 25. In that case the condition would be 25 > 100, which would be false, so the loops will break.

8 0
4 years ago
A STANDARDIZED RECIPE WILL ALWAYS MAKE A CONSISTENT quality AND CONSISTENT
Zielflug [23.3K]

Answer:

Quantity.

Explanation:

A standardized prescription is one that contains generic prescriptions indicated for a certain disease, that is, one that contains the basic treatments indicated for it, including drugs and treatments prescribed in uniform quantities and qualities for all patients. Thus, these recipes do not aim at the individual characteristics of the patient, but at the general characteristics of the diagnosed disease and its main treatments.

7 0
3 years ago
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