WPH0 QR Dynamic Papers Physics al Edexcel

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Edexcel | Physics WPH0 | W 11 5 1 | 1 hour 30 minutes

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A copper wire, diameter 1.63 mm and length 105 km, is to be melted down to sell for scrap.

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(a) (I)

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3 Mark s

Show that the mass of the wire is about 2000 kg.

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(a) (II)

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2 Mark s

The wire is initially at a temperature of and its melting point is 1085?C.

Calculate the energy required to raise the temperature of the wire to its melting

point.

Energy = . . . . . . . . . .

14

(b)

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2 Mark s

Once the melting point is reached, there is no further increase in temperature until

all of the copper has melted. Discuss what happens to the energy of the copper

atoms before and during the melting process.

Idea that whilst copper is being heated to melting point, energy supplied

is (mainly) transformed into K.E. of atoms/molecules

At melting point:

no change in K.E. of atoms/molecules OR energy supplied is

transformed into P.E. of atoms/molecules

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