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andrey2020 [161]

3 years ago

15

What is the change in internal energy if 20 J of heat is released from a system and the system does 50 J of work on the surround

ings?
A.-80 J
B.-20 J
C.80 J
D.20 J

2 answers:

Novay_Z [31]3 years ago

4 0

Answer:

A is the answer to this question. Hope this helps!

hjlf3 years ago

3 0

The correct answer is a -80 J

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A reaction taking place in a container with a piston-cylinder assembly at constant temperature produces a gas, and the volume in

djverab [1.8K]

Answer:

60.4 J

Explanation:

The work done by the gas is given by:

$W=p(V_f-V_i)$

where

p is the gas pressure

$V_f$ is the final volume of the gas

$V_i$ is the initial volume

We must convert all the quantities into SI units:

$p=860 torr \cdot \frac{1.013\cdot 10^5 pa}{760 torr}=1.146\cdot 10^5 Pa$

$V_i = 127 mL = 0.127 L = 0.127 dm^3 = 0.127 \cdot 10^{-3}m^2$

$V_f = 654 mL = 0.654 L = 0.654 dm^3 = 0.654 \cdot 10^{-3}m^2$

So the work done is

$W=(1.146\cdot 10^5 Pa)(0.654\cdot 10^{-3} m^3-0.127\cdot 10^{-3} m^3)=60.4 J$

4 0

3 years ago

OleMash [197]

Answer:

R= 5.4 ohms

Explanation:

Given that

V= 9 V

Power ,P= 15 W

Lets take resistor resistance = R

We know that Power given as

$P=\dfrac{V^2}{R}$

V=Voltage

P=Power

R=Resistance

$R=\dfrac{V^2}{P}$

Now by putting the all the values in the above equation

$R=\dfrac{9^2}{15}$

R= 5.4 ohms

Therefore the resistance of the resister will be 5.4 ohms.

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A person will feel weightless whenever?

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When your'e in space you feel weightless blc there's no grsvity in space.

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Explanation:

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2 years ago