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3 years ago

According to the first law of thermodynamics, what could happen when heat is added to a system?

2 answers:

8 0

B, since B claims that the heat is transferred, while A and D have energy decreasing or being destroyed and C has energy being created. First law of thermodynamics in layman terms: Energy can neither be created nor destroyed

DedPeter [7]3 years ago

8 0

Answer:

Explanation:

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A jeweler needs to electroplate gold onto a bracelet using an ionic solution. He knows that the charge carriers in the ionic sol

Studentka2010 [4]

Explanation:

First, we will calculate the total charge as follows.

$q_{total} = \frac{\text{weight of gold to be deposited}}{\text{atomic mass of gold}} \times N_{A} \times \text{charge on electron}$

= $\frac{0.2 g}{196.97 g/mol} \times 6.02 \times 10^{23} \times 1.6 \times 10^{-19} C$

= 97.80 C

Now, we will calculate the current required by the jeweler to plate the bracelet as follows.

i = $\frac{q_{total}}{t_{total}}$

= $\frac{97.80 C}{3 \times 60 \times 60 sec}$

= $9.05 \times 10^{-3}$ A

or, = 9.05 mA

thus, we can conclude that 9.05 mA current should he use to electroplate the bracelet in three hours.

7 0

3 years ago

Do the same molecules have to be present on both sides of a chemical equation?<br> why or why not?

Nadusha1986 [10]

Yes, the same molecules have to be present on both sides of a chemical equation. This is because the equation has to be able to be balanced, and without the same amount of each molecule on each side of the equation, it could not be balanced.

7 0

3 years ago

What type of elastic force is present in the strings on a guitar?

jeyben [28]

B) Tension , is the correct answer

4 0

3 years ago

A bird sits on top of a 639 m tall tower. If it's gravitational potential energy up there is 2033 J, what is its mass?

iris [78.8K]

The mass of the bird is 0.32 kg.

<u>Explanation:</u>

Gravitational potential energy, the energy exhibited by an object at rest due to the influence of gravitational force. So the increase in distance of object from the surface of earth leads to increase in the gravitational potential energy. Thus,

$\text {Gravitational potential energy}=m \times \text { Acceleration } \times \text { Distance of bird from bottom }$

So, as the gravitational potential energy is given as 2033 J and the position of bird placed on the tall tower is 639 m away from the bottom, then the mass (m) of the bird can be found as below.

$m o f \text { bird }=\frac{\text {Gravitational potential energy}}{a \times \text {Distance}}=\frac{2033}{9.8 \times 639}=\frac{2033}{6262.2}$

So, finally we get the bird's mass as,

m of bird = 0.32 kg

7 0

3 years ago

Which of the following statements about the impact of biotechnology on the environment is not true?

Vladimir79 [104]

E) Biotechnology use can lead to an increase in soil erosion and pollution runoff through decreased pesticide use.

Explanation:

Biotechnology use cannot lead to an increase in soil erosion and pollution runoff through decreased pesticide use.

There is no relationship between biotechnology use and increase soil erosion and pollution run off.

Biotechnology involves the application of technology based on living things.

learn more:

Influence of science on society.

#learnwithBrainly

3 0

3 years ago

Read 2 more answers