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bagirrra123 [75]
3 years ago
10

Water cools from 68 cto 23 c in 30 min. What is the rate of temperature change?

Physics
2 answers:
trapecia [35]3 years ago
3 0
1.5 c a minute. hope it helps
Snezhnost [94]3 years ago
3 0

Answer:

-1,5º per minute.

Explanation:

To solve this we just need to divide the number of grades that the temperature cooled off between the amount of minutes in which that change was experienced:

Change in temperature= Final temperature-initial temperature

Ct=23-68=-45

we divide the -45º by the 30 minutes:

-45/30=-1,5

So we know that the water changed its temperature at -1,5 grades per minute.

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This question is math why u put it on chemistry tho
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The difference between an innate behavior and a learned behavior is that a learned behavior is __________ and an innate behavior
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ANSWER:

D. A result of experience.

The difference between an innate behaviour and learned behaviour is that a learned behaviour is a result of experience and an innate behaviour is not.
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Why must the difference between the water level in the eudiometer tube and the water level in the beaker be measured
Bas_tet [7]

Answer:

Explanation:

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3 0
3 years ago
An energy plant produces an output potential of 1500 kV and serves a city 143 km away. A high-voltage transmission line carries
jekas [21]

Answer:

2123.55 $/hr

Explanation:

Given parameters are:

V_{plant} = 1500 KV

L = 143 km

I = 500 A

\rho = 2.4 \Omega / km

So, we will find the voltage potential provided for the city as:

V_{wire} =IR = I\rho L = 1500*2.4*143 = 514.8 kV

V_{city} = V_{plant}- V_{wire} = 1500-514.8 = 985.2 kV

Then, we will find dissipated power because of the resistive loss on the transmission line as:

P = I^2R = I^2\rho L=500^2*2.4*143 = 8.58*10^7 W

Since the charge of plant is not given for electric energy, let's assume it randomly as x =  \frac{\dollar 0.081}{kW.hr}

Then, we will find the price of energy transmitted to the city as:

Cost = P * x = 8.58*10^7 * 0.081 * 0.001 = 6949.8 $/hr

To calculate money per hour saved by increasing the electric potential of the power plant:

Finally,

I_{new} = P/V_{new} = I/1.2\\P_{new} = I_{new}^2R_{wire}\\Cost = P_{new}/1.44=6949.8/1.44 = 4826.25 $/hr

The amount of money saved per hour = 6949.8 - 6949.8/1.44 = 2123.55 $/hr

Note: For different value of the price of energy, it just can be substituted in the equations above, and proper result can be found accordingly.

3 0
3 years ago
Matter can exist in hw many states​
Mariulka [41]

Answer:

Matter can exist in four different states: solids, liquids, gases and plasma.

Explanation:

Hope this helps :)

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