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3 years ago

LOOK AT THE PICTURE!! 3 Please answer properly

Physics

2 answers:

Bogdan [553]3 years ago

8 0

Highest point ( A ) ...

Not moving ==> zero kinetic energy
Highest altitude ==> maximum potential energy
------------------------------------
Total energy ==> all potential

Halfway up, halfway down ( B ) ...

Half-altitude ==> half of total energy is potential
Moving ==> some kinetic energy; must be half of total
-----------------------------------------
Total energy ==> same total; half potential, half kinetic

Lowest point ( C ) ...

Minimum altitude ==> zero potential energy
Fastest speed ==> maximum kinetic energy
-----------------------------------------
Total energy ==> same total; no potential, all kinetic

babunello [35]3 years ago

4 0

The total energy at A, B and C is constant and does not change.

At A, all the energy is potential energy. It gets converted partially to kinetic energy at B and is completely converted to kinetic energy at C. At C, all the energy is kinetic energy.

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t's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Loo

Ket [755]

Answer:

D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.

Explanation:

- A physical change is a change in which there is no formation of new substances. Examples of physical changes are the melting or the evaporation of a substance (all phase transitions are examples of physical changes): in such cases, there is no formation of new substances.

- A chemical change is a change in which new substances form. Examples of chemical changes are the chemical reactions: for instance, when a candle burns, a reaction is taken place (oxygen is burnt, transforming into carbon dioxide + heat + light, so this is an example of chemical change).

Therefore, the correct answer is

D) Roger is incorrect. Only a chemical change is taking place as evidenced by the light and heat of the burning candles.

5 0

3 years ago

Read 2 more answers

A rotating wheel requires 3.05-s to rotate through 37.0 revolutions. Its angular speed at the end of the 3.05-s interval is 97.9

Setler79 [48]

Answer:

$\alpha=14.2rad/s^2$

Explanation:

The formula that relates angular displacement with angular acceleration is:

$\Delta \theta=\omega_i t+\frac{\alpha t^2}{2}$

We can obtain $\omega_i$ from the definition of angular acceleration:

$\alpha=\frac{\Delta \omega}{\Delta t}=\frac{\omega_f-\omega_i}{t}$

$\omega_i=\omega_f-\alpha t$

Putting all together:

$\Delta \theta=(\omega_f-\alpha t) t+\frac{\alpha t^2}{2}=\omega_f t-\frac{\alpha t^2}{2}$

Which, since we want the angular acceleration, is:

$\alpha=\frac{2(\omega_f t-\Delta \theta)}{t^2}$

And for our values is:

$\alpha=\frac{2((97.9rad/s)(3.05s)-(37(2\pi rad)))}{(3.05s)^2}=14.2rad/s^2$

5 0

3 years ago

What happens to a solid when thermal energy is added?

GalinKa [24]

This happens at the boiling temperature of every substance that can vaporize. At the boiling temperature, adding heat energy converts the liquid into a gas WITHOUT RAISING THE TEMPERATURE.The same thing happens when a solid changes into liquid. For instance, ice and water can exist together at the melting temperature.

7 0

3 years ago

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Unpolarized light is passed through an optical filter that is oriented in the vertical direction.

VashaNatasha [74]

In order to solve this problem it is necessary to apply the concepts related to intensity and specifically described in Malus's law.

Malus's law warns that

$I = I_0 cos^2\theta$