Substance which will take more energy
For each and every pair of substances, circle the substance which will take more energy to heat from 20 degrees Celsius to 100 degrees Celsius and describe why?
i) 30 g of water versus 300 g of water.
ii) 500 g of iron versus 500 g of silver.
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A certain camera lens consists of a focal length of 175 mm. Its position can be adjusted to make images if the lens is between 180 mm and 210 mm from the plane of the film. Over what range of object distances is the lens helpful?
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