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UNO [17]
3 years ago
6

Your friend's car is stuck in the snow. You push very hard and become very 1 tired but the car won't move. Did you do work?

Physics
1 answer:
crimeas [40]3 years ago
7 0

Answer:

Yes you  worked

Explanation:

You may have not seen a good outcome but you did put effort in.

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2 years ago
How much ice (at 0°C) must be added to 1.90 kg of water at 79 °C so as to end up with all liquid at 8 °C? (ci = 2000 J/(kg.°
muminat

m = mass of the ice added = ?

M = mass of water = 1.90 kg

c_{w} = specific heat of the water = 4186 J/(kg ⁰C)

c_{i}  = specific heat of the ice = 2000 J/(kg ⁰C)

L_{f} = latent heat of fusion of ice to water = 3.35 x 10⁵ J/kg

T_{ii}  = initial temperature of ice = 0 ⁰C

T_{wi} = initial temperature of water = 79 ⁰C

T = final equilibrium temperature = 8 ⁰C

using conservation of heat

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inserting the values

m (4186) (8 - 0) + m (3.35 x 10⁵ ) = (1.90) (4186) (79 - 8)

m = 1.53 kg

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3 years ago
If a star is 13.7 light years away from earth, how can we tell which elements it is made of?
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Explanation:

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