Hey there! Sign in to join this conversationNew here? Join for free
    • Thread Starter
    Offline

    11
    ReputationRep:
    Image is below
    Thank you
    • Thread Starter
    Offline

    11
    ReputationRep:
    Name:  ImageUploadedByStudent Room1463827628.469944.jpg
Views: 115
Size:  130.1 KB


    Posted from TSR Mobile
    • PS Reviewer
    Offline

    20
    ReputationRep:
    PS Reviewer
    (Original post by z_o_e)
    Image is below
    Thank you
    What are you confused about?
    Offline

    21
    ReputationRep:
    Isn't the specific heat capacity of water 4200J/kg/C or something like that?
    So I'm guessing you would do:
    0.75 * (90-30) * 4200
    = 0.75 * 60 * 4200
    = 189000J?
    Offline

    12
    ReputationRep:
    Name:  WIN_20160521_120420.JPG
Views: 89
Size:  77.4 KB
    Offline

    12
    ReputationRep:
    Misleading question. It says how much energy is released when the temperature goes DOWN. Energy must have been absorbed by the water which is why I got a negative value
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by Nayzar)
    Name:  WIN_20160521_120420.JPG
Views: 89
Size:  77.4 KB
    Thanks

    Can someone explain this please. It would be better if you don't say the answer

    Posted from TSR Mobile
    Attached Images
     
    Offline

    12
    (Original post by z_o_e)
    Thanks

    Can someone explain this please. It would be better if you don't say the answer

    Posted from TSR Mobile
    150 is lost through the roof, right? The table tells us that and we can see the total is 600.
    So 150/600 is the amount lost from roof and we're told the house costs £800 per year to heat.

    Hopefully you have figured out how much is wasted from the roof now and to find how much money is wasted because of the amount of heat lost through the roof we use the amount we have worked out wasted from the roof and we know the house costs £800 per year to heat so we... ?
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by _Xenon_)
    150 is lost through the roof, right? The table tells us that and we can see the total is 600.
    So 150/600 is the amount lost from roof and we're told the house costs £800 per year to heat.

    Hopefully you have figured out how much is wasted from the roof now and to find how much money is wasted because of the amount of heat lost through the roof we use the amount we have worked out wasted from the roof and we know the house costs £800 per year to heat so we... ?
    I did 150/600= 0.25
    0.25*100= £25

    Then 800/25 = £32

    Posted from TSR Mobile
    • Community Assistant
    Offline

    21
    ReputationRep:
    Community Assistant
    (Original post by z_o_e)
    I did 150/600= 0.25
    0.25*100= £25

    Then 800/25 = £32

    Posted from TSR Mobile
    Quarter of energy lost is through the roof, so quarter of money lost is through the roof.
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by Vikingninja)
    Quarter of energy lost is through the roof, so quarter of money lost is through the roof.
    Was £32 right then

    Posted from TSR Mobile
    • Community Assistant
    Offline

    21
    ReputationRep:
    Community Assistant
    (Original post by z_o_e)
    Was £32 right then

    Posted from TSR Mobile
    No because 32 isn't a quarter of 800.
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by Vikingninja)
    No because 32 isn't a quarter of 800.
    I give up.

    Posted from TSR Mobile
    Offline

    12
    (Original post by z_o_e)
    I did 150/600= 0.25
    0.25*100= £25

    Then 800/25 = £32

    Posted from TSR Mobile
    No because the question tells us it costs £800 per year to heat the house and we've already worked out how much is wasted from the roof so we multiply what we worked out by that in order to find the MONEY that's wasted through the roof
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by _Xenon_)
    No because the question tells us it costs £800 per year to heat the house and we've already worked out how much is wasted from the roof so we multiply what we worked out by that in order to find the MONEY that's wasted through the roof
    I got 200

    Posted from TSR Mobile
    Offline

    12
    (Original post by z_o_e)
    I got 200

    Posted from TSR Mobile
    Correct. The answer is £200.

    Do you understand or would you like me to explain some more?
    • Thread Starter
    Offline

    11
    ReputationRep:
    (Original post by _Xenon_)
    Correct. The answer is £200.

    Do you understand or would you like me to explain some more?


    Posted from TSR Mobile
    Attached Images
     
 
 
 
Poll
Do you agree with the PM's proposal to cut tuition fees for some courses?
Useful resources

Study tools

Rosette

Essay expert

Learn to write like a pro with our ultimate essay guide.

Thinking about uni already?

Thinking about uni already?

See where you can apply with our uni match tool

Student chat

Ask a question

Chat to other GCSE students and get your study questions answered.

Creating

Make study resources

Create all the resources you need to get the grades.

Planner

Create your own Study Plan

Organise all your homework and exams so you never miss another deadline.

Resources by subject

From flashcards to mind maps; there's everything you need for all of your GCSE subjects.

Papers

Find past papers

100s of GCSE past papers for all your subjects at your fingertips.

Help out other students

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.