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alisha [4.7K]
3 years ago
13

How much heat is lost by 2.0 grams of water if the temperature drops from 31 °C to 29 °C? The specific heat of water is 4.184 J/

(g • °C) *
1 point

a) 4.0 J

b) - 7.5 J

c)- 8.4 J

d) - 16.7 J​
Physics
1 answer:
Elanso [62]3 years ago
4 0

Given :

Mass of water, m = 2 grams.

The temperature of water drops from 31 °C to 29 °C .

The specific heat of water is 4.184 J/(g • °C).

To Find :

Amount of heat lost in this process.

Solution :

We know, heat lost is given by :

Heat\ lost,H = ms( T_f - T_i)\\\\H = 2\times 4.184 \times ( 31 - 29 )\ J\\\\H = 16.736\ J

Therefore, amount of heat lost in this process is 16.736 J.

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Air is cooled in a process with constant pressure of 150 kPa. Before the process begins, air has a specific volume of 0.062 m^3/
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Answer:

The pressure is constant, and it is P = 150kpa.

the specific volumes are:

initial = 0.062 m^3/kg

final = 0.027 m^3/kg.

Then, the specific work can be written as:

W = \int\limits^{vf}_{vi} {Pdv} \, = P(vf - vi) = 150kPa*(0.0027 - 0.062)m^3/kg = -5.25 kPa*m^3/kg.

The fact that the work is negative, means that we need to apply work to the air in order to compress it.

Now, to write it in more common units we have that:

1 kPa*m^3 = 1000J.

-5.25 kPa*m^3/kg = -5250 J/kg.

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3 years ago
What is lighting and lighting conductor​
Igoryamba

Answer:

Lightning is a process that occurs when the positive and negative charges present in the cloud build up in such a manner that a spark of lightning occurs between the two of them in the cloud. ... A metal rod placed on top of a building to protect it from a lightning strike is known as a lightning conductor.

Explanation:

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2 years ago
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What happens to the speed of light as it passes into a glass block?
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3 years ago
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If something is 50% efficient, how many joules of wasted energy will there be if 750J of energy is put in?
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Answer:

<u><em>375 J</em></u>

Explanation:

<u><em>Total energy</em></u> = 750 J

<u><em>Efficiency</em></u> = 50%

<u><em>Wasted energy</em></u> = 50% [100% - 50%]

<u><em>Amount of wasted energy</em></u>

= 750 x 50%

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2 years ago
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A jet moving at 500.0 km/ h due is in a region where the wind is moving at 120.0 km/h in a direction 30.00° north of east. What
WARRIOR [948]

Answer:

The speed of the aircraft relative to the ground is 606.9 m/s^2

Explanation:

x-y coordinate system:  

x is Positive due East direction. Similarly  y is Positive due North Direction.

Now let us Decompose each vector into x-y

500 km/h due east = (500, 0)

120 km/h at 30 degree north of east

= (120 cos(30), 120 \times sin(30))

= (120 \times \frac{\sqrt{(3)}}{2}, 120 \times \frac{1}{ 2})

= (60 \times \sqrt(3), 60)

Adding  the vectors.

=(500, 0) + (60 \times \sqrt{3}, 60)

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Returning back to polar form

Magnitude = \sqrt{603.923^2 + 60^2} = 606.9

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3 years ago
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