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zvonat [6]
4 years ago
12

What is the change of entropy for a heat engine using 500.0j at 20.0c

Mathematics
2 answers:
ExtremeBDS [4]4 years ago
8 0

The formula to find change in entropy is given by :

Change in entropy = \frac{Q}{T}

where Q is change in heat and T is temperature.

We are given Q = 500 joule and T = 20 degree C

Plugging these values in the formula,

Change in entropy = \frac{500}{20}

We get change in entropy = 25 J/Celsius.


Natasha_Volkova [10]4 years ago
3 0
1.71 J/K 
hope it helps :D!!
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Need help with math's home work
Aleonysh [2.5K]
1. The best thing to do is to find out what 1% is. 235/100= 2.35
As you're looking for 27%, you then multiply 2.35*27= 63.45
As you're increasing it, you've then got to add this to the original amount.
235+63.45= 298.45

2. Again, find 1%. 24/100= 0.24
0.24*9= 2.16
24+2.16= 26.16

3. Find 1%. 1120/100= 11.2
As you're looking for 13.5%, you then multiply this by 13.5
11.2*13.5= 151.20
As you're subtracting, you then take this away from the original number.
1120-151.20= 968.80

4. This time, you can find 10%.
0.057/10= 0.0057
0.0057*5.5= 0.03135.
You've then got to subtract this as you're decreasing the number.
0.057-0.03135= 0.02565.

Sally's investment is now worth £585. (Find the 30% and add it on) and Susie's investment is now worth £585 (Find the 10% and subtract). They both have the same amount of money.

Hope this helps :) 
8 0
3 years ago
NEED HELP!! 15 POINTS!!!
Free_Kalibri [48]

Answer:

Option B) add 5 to both sides of the equation

Step-by-step explanation:

we have

x^{2}+18x+76=0

step 1

Add 5 to both sides of the equation

x^{2}+18x+76+5=0+5

x^{2}+18x+81=5

step 2

Rewrite as perfect squares

(x+9)^{2}=5

5 0
4 years ago
Read 2 more answers
There are subgroup in the real number system. A10, B5 ,C3,D4
Snowcat [4.5K]

We need more info for this question...

5 0
3 years ago
Find the square root of the following number correct up to three decimal places a 11 b 6.3 c4.2d124​
jek_recluse [69]

Using a calculator, you should find these approximations

\sqrt{11} \approx 3.317\\\\\sqrt{6.3} \approx 2.510\\\\\sqrt{4.2} \approx 2.049\\\\\sqrt{124} \approx 11.136

3 0
4 years ago
Which calculation and answer show how to convert 3/12 into a decimal
HACTEHA [7]

Answer:

0.25

Step-by-step explanation:

you just divide 3 by 12. And that will get you 0.25

3 0
3 years ago
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