All categories

3 years ago

With Brainly, what happens if no one answers your question? Do you get points back?

Physics

2 answers:

mestny [16]3 years ago

6 0

Answer: No you will not get your points back. It will stay there until someone awnser it or deletes it.

Gre4nikov [31]3 years ago

4 0

Explanation: When nobody answers your question, you cannot get your points back. Even if the moderators delete it. I'm sorry.

Hope this helps! :D

-TanqR

(Please mark me as brainliest)

You might be interested in

Why is the United States considered a multiethnic country?

kirza4 [7]

I am pretty sure it’s all the above

6 0

3 years ago

Read 2 more answers

Why does it rain a lot?

Vaselesa [24]

Answer:

Clouds are made up of tiny water droplets. ... As more and more droplets join together they become too heavy and fall from the cloud as rain. Warm air can hold more moisture than cool air. When the warmer air is cooled and the moisture condenses, it often rains more heavily.

Explanation:

hope it helps

3 0

3 years ago

What happens when a sample of water turns to ice

TiliK225 [7]

$\huge{\underline{\underline{\mathrm{\color{red}{AnswEr}}}}}$

As a sample of water turns to ice, A new molecules are formed.

5 0

3 years ago

Read 2 more answers

1.45 L of 16°C water is placed in a refrigerator. The refrigerator's motor must supply an extra 10.7 W power to chill the water

Vika [28.1K]

Answer:

The coefficient of performance of the refrigerator is 2.251.

Explanation:

In this case, the coefficient of performance of the refrigerator ( $COP$ ), no unit, is equal to the ratio of the heat rate received from the water to the power needed to work, that is:

$COP = \frac{\dot Q_{L}}{\dot W}$ (1)

$COP = \frac{\rho\cdot V\cdot c_{w}\cdot \Delta T}{\dot W \cdot \Delta t}$ (2)

Where:

$\dot Q_{L}$ - Heat rate received from the water, in watts.

$\dot W$ - Power, in watts.

$\rho$ - Density of water, in kilograms per cubic meter.

$V$ - Volume of water, in cubic meters.

$c_{w}$ - Specific heat of water, in joules per kilogram-degree Celsius.

$\Delta T$ - Temperature change, in degrees Celsius.

$\Delta t$ - Cooling time, in seconds.

If we know that $\rho = 1000\,\frac{kg}{m^{3}}$ , $V = 1.45\times 10^{-3}\,m^{3}$ , $c_{w} = 4187\,\frac{J}{kg\cdot ^{ \circ}C}$ , $\Delta T = 10\,^{\circ}C$ , $\dot W = 10.7\,W$ and $\Delta t = 2520\,s$ , then the coefficient of refrigeration of the refrigerator is: