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3 years ago

1.

2 answers:

7 0

1.renewable energy
2.renewable energy
3.Turning off the lights when you are not in a room
4.conservation of energy
5.Driving an SUV
6.stored energy
7.Always from one side to another
8.use our energy resources wisely
9.conservation of energy
10.by either moving liquids or moving air currrents
11.potential energy
12.radiation
13.insulators
14.radiation
15.Evaporation
16.Thermal energy moves to an object with less heat.
17.Burning your finger on a hot match
18.potential energy
19.Energy is never being created or destroyed.
20.touching each other

AnnZ [28]3 years ago

6 0

Explanation:

1. Renewable Energy. These sources are natural sources of energy and has zero emission in comparison to the fossil fuels.

2. Renewable Energy. As Sun light is natural and will last forever.

3. Taking long, hot showers. As this activity is resulting in waste of energy it can not show energy conservation.

4. Conservation of Energy. According to the law the total of all the energy in an isolated system remains constant i.e. conserved.

5. Turning off the lights when you are not in a room. As this activity is resulting in saving energy.

6. Stored energy. Potential energy is the energy stored or held by any object because of its position.

7. Always to a place of lower thermal energy. The flow of thermal energy causes heat and it always moves from high temperature to low temperature.

8. Use our energy resources wisely. Conservation of energy means using the resources wisely. You might think that we should recycle all of our energy. But most of the time that is not possible.

9. Conservation of Energy. According to the law the total of all the energy in an isolated system will always remain constant i.e. conserved. It means it cannot be destroyed or created. It can only be converted from one type of energy to another.

10. By either moving liquids or moving air currents. Convection is a process of energy transfer where hot particles of liquid or gas move up loses energy, dive down and are replaced by hotter particles.

11. Potential energy. Potential energy is the energy stored. In the batteries chemical energy is stored which get converted to electrical energy for the flashlight to work.

12. Conduction. As the heat energy will be transferred through the water molecules which are in contact with each other.

13. Insulators. These are the objects which do not conduct heat well. Example: Wood.

14. Radiation. The energy of the Sun or stars is transferred through electromagnetic radiations.

15. Convection. In convection the heat is transferred through the motion of particles. Here the hot water will move up and cold water will move down.

16. Thermal energy moves to an object with less heat.

17. Burning your finger on a hot match. Because for conduction to happen the two objects must touch each other.

18. Potential energy.

19. Energy is never being created or destroyed.

20. Touching each other.

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A 15g bullet is fired horizontally into a 3kg block of wood suspended by a long cord. Assume that the bullet remains in the bloc

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Answer:

261.3 m/s

Explanation:

Mass of bullet=m=15 g= $\frac{15}{1000}=0.015 kg$

1 kg=1000g

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Total mass =M+m=3+0.015=3.015 kg

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Using g= $9.8m/s^2$

Substitute the values

$\frac{1}{2}(3.015)V^2=3.015\times 9.8\times 0.086$

$V^2=\frac{2\times 3.015\times 9.8\times 0.086}{3.015}$

$V=\sqrt{2\times 3.015\times 9.8\times 0.086}}$

$V=1.3m/s$

Velocity after collision=V=1.3 m/s

Velocity of block=v'=0

Using conservation law of momentum

$mv+Mv'=(m+M)V$

Using the formula

$0.015v+3(0)=3.015(1.3)$

$0.015v=3.015(1.3)$

$v^2=\frac{3.015(1.3)}{0.015}=261.3$

$v=261.3 m/s$

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3 years ago

When the distance between two charges is halved, the electrical force between them?

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If the distance between two charges is halved, the electrical force between them increases by a factor 4.

In fact, the magnitude of the electric force between two charges is given by:
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r is the separation between the two charges

We see that the magnitude of the force F is inversely proportional to the square of the distance r. Therefore, if the radius is halved:
$r'= \frac{r}{2}$
the magnitude of the force changes as follows:
$F'=k \frac{q_1 q_2}{r'^2}=k \frac{q_1 q_2}{( \frac{r}{2})^2 }=k \frac{q_1 q_2}{ \frac{r^2}{4} } =4k \frac{q_1 q_2}{r^2}=4 F$
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