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Yaseen Manzoor(1)

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Yaseen Manzoor(2)

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Thaung Tike(Leo)

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Thaung Tike(Leo)

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Question 1a and 1b

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Questions 2-4

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it is my homework

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it is my homework

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1a. Energy is needed to break the bonds of the metal particles apart in order for them to melt.

1b. It is because the internal energy of a solid is very low, if freezing water to ice, that needs water to reduce its internal energy.

2. P=E/t
3000*120=E
E=360000J
E=ml
360000/2.25*10^6=m
m=0.16kg

3a. E=mcΔT
E=(0.08)(4200)(15)
E=5040J
5040/1200
=4.2Js^-1

3b.E=ml
E=0.08*(3.36*10^5)
E=26880
P=E/t
4.2=26880/t
26880/4.2=t
t=6400s

4a.E=mcΔT
E=0.12*1200*18
E=2592J
2592/120
=21.6Js^-1

4b.E=Pt
E=21.6*300
E=6480J

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abdulaziz

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abdulaziz

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未命名的筆記本 (26)

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1a) energy is needed to break bonds between atoms
1b) The reduce in internal energy will cause water molecules to move slow enough for the force bond to pull molecules together to freeze.
2) E=ml
Pt = ml
3000*2*60=2.25*10^6 m
m=0.16 kg
3a) E=mcΔT
P=0.08*15*4200+/120
P=4.2J
3b) E=ml
E=0.08*3.36*10^5
t=26880/4.2J
t=6400 s
4a) E=mcΔT
Pt=mcΔT
P=0.12*1200*18/120
p=21.6W
b) 21.6*300=6480 J

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1. a) energy is needed to melt a solid because it breaks the bond between atoms
b) internal energy of water must be           reduced to form bonds between H2O atoms
2. E=mL
360000=m*(2.25*10^6)
m=0.16kg
3. a) E=mc∆T
E=0.08*4200*15
E s^-1=5040/1200
P=4.2J
b) P=mL/t
4.2=0.08*3.36*10^5/t
t=6400s
4. a) E=mc∆T
Pt=mc∆T
P=0.12*1200*18/120
P=21.6W
b) 21.6*300=6480J