Cyfwerth mecanyddol gwres – problemau ac atebion

1. 2 k cal (cilo c calorïau e ) = ….. c calorïau e?

Ateb

1 kcal = 1000 kcal

2 k cal = 2 (1000 c calorïau e ) = 2000 c calorïau e

2. 4 C calorie e = ….. c calorïau e?

Ateb

1 Calori e ( Prifddinas C ) = 1 k cal = 1000 calori e

4 C o galorïau e = 4 ( 1000 c o galorïau e ) = 4000 c o galorïau

3. 10 c o galorïau e = ….. Joule?

Ateb

1 calorïau e = 4.186 Joules

10 c calorïau e = 10 (4.186 Joules) = 41.86 Joules

4. 5 kcal = ….. Joule ?

Ateb

1 k cal = 1000 c alor = 4186 Joule

5 k cal = 5 (4186 Joule) = 20930 Joule

5. 2000 Joule = ….. k cal?

Ateb

4186 Joule = 1 kcal

8372 Joule = 8372 / 4186 = 2 kcal

2000 Joule = 2000 / 4186 = 0.4777 kcal

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