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July 22, 2019, 02:54:16 am

Author Topic: PhysIcs questions  (Read 570 times)  Share 

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Abi21

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PhysIcs questions
« on: January 23, 2018, 11:12:09 am »
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Hi, I'm struggling with two physics questions, hoping for a little bit of help please!

1) 0.5 kg of ice at 0 degrees is mixed with 0.1kg of steam at 100 degrees. What will be the final temperature?

2) A student attempts to identify metal by measuring the specific heat capacity. 100g of the metal is heated to 75 degrees and then transferred to a 70g copper calorimeter containing 200g of water at 20 degrees. The temperature of the final mixture is 25 degrees? What metal is the student testing? ( given a bunch of metals with their approximate specific heat capacity)

Thanks in advance!

KiNSKi01

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Re: PhysIcs questions
« Reply #1 on: January 24, 2018, 04:29:14 pm »
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Yo Abi21!

These are the harder specific heat capacity questions you get and where strong problem solving/maths skills come in.

For the first question you realise that 'Q' in Q=mc delta*T is the same for the ice and the steam. Secondly the final temperature for the ice and steam will be the same so delta*T for the ice is (Tfinal - 0) and for the steam it would  be (100-Tfinal). Just realised that for this question you would also have to consider the latent heat when both substances change state into water  :P So yeah tricky question. When it comes down to it all you are doing is setting two equations equal to each other and solving an unknown variable. Looks like the second question is similar except easier as you dont have to consider latent heat.

Hope I helped!
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Abi21

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Re: PhysIcs questions
« Reply #2 on: January 24, 2018, 05:52:27 pm »
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Yo Abi21!

These are the harder specific heat capacity questions you get and where strong problem solving/maths skills come in.

For the first question you realise that 'Q' in Q=mc delta*T is the same for the ice and the steam. Secondly the final temperature for the ice and steam will be the same so delta*T for the ice is (Tfinal - 0) and for the steam it would  be (100-Tfinal). Just realised that for this question you would also have to consider the latent heat when both substances change state into water  :P So yeah tricky question. When it comes down to it all you are doing is setting two equations equal to each other and solving an unknown variable. Looks like the second question is similar except easier as you dont have to consider latent heat.

Hope I helped!
THANKS SO MUCH LEGEND!!!!