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gtnhenbr [62]
2 years ago
10

How much he is given out 185 g of lead cools from 200 Celsius to 10 Celsius

Physics
1 answer:
ioda2 years ago
5 0

Given data

mass (m) = 185 g  = 0.185 Kg ,

temperature (T₁) = 200°C = 200 + 273 = 473 K

temperature (T₂) = 10°C = 10+273 = 283 K

Specific haet at constant pressure (Cp) = 2.108 Kj/Kg k

                <em>Heat transfer (Q) = m.Cp.( T₂- T₁) J</em>

                                            = 0.185 × 2.108 × (283 - 473)

                                        <em>  Q = -74.09 KJ</em>

<em>Heat rejected from ice is 74 J</em>


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Displacement vectors of 4km north, 2km south, 5km north, 5km south combine to a total displacement of
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<u>Answer</u>

The combined displacement is 2km north


<u>Explanation</u>


Since displacement is a vector quantity, we take into account the direction.


Good for us all the displacement vectors are in the same dimension, so we can make north positive and south negative or vice-versa.


We now add to obtain,

4+-2+5+-5

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You buy a 75 watt light bulb. the label means that
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We see a full moon by reflected sunlight. How much earlier did the light that enters our eye leave the sun? the earth-moon and e
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The time taken by the light reflected from sun to reach on earth will be 8.4 minutes.

To find the answer, we need to know about the distance travelled by light.

<h3>How to find the time taken by the light reflected from sun to reach on earth?</h3>
  • So, in order to solve this problem, we must first know how far the moon is from Earth and how far the Sun is from the moon.
  • These distances are given as 3.8×10^5 km (Earth-Moon) and 1.5×10^8 km (Sun- Earth).
  • Since the Moon and Sun are on opposite sides of Earth during a full moon, the light's distance traveled equals,

         d=(1.5*10^8km)+2(3.8*10^5km)=1.51*10^8km=1.51*10^{11}m

  • As we know that light travels at a speed of 300,000 km per second. then, the time taken by the light reflected from sun to reach on earth will be,

                      t=\frac{1.51*10^{11}}{3*10^8}=503.33 s\\t=\frac{503.33}{60}=8.4min

Thus, the time it takes for the light from the Sun to reach Earth and be recognized as 8.4 minutes.

Learn more about distance here:

brainly.com/question/11495758

#SPJ4

6 0
1 year ago
Math Exploration
Airida [17]

Question: What is the frequency of a wave that has a wave speed of 120 m/s and a wavelength of 0.40 m?

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Explanation: this might help for

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