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Q: Which thermodynamic law says that you cannot convert 100 percent of a heat source into mechanical energy?

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You cannot convert 5 percent to mm.

You cannot have a percentage of a single measure.

You cannot, without further information.

You cannot. A percent is a pure number while an inch is a measure of distance.

31.9% = 319/10 which cannot be simplified.

91 _____ ... you cannot simplify it further. 100

You cannot. A percent is a pure number with no dimensions, whereas a tonne is a measure of mass with dimension [M].

You cannot without information on the densities of the two substances.

You cannot. 15% is a fraction equal to 0.15. It is not and cannot be converted to a whole number.

62.7% = 62.7/100 = 627/1000 which cannot be simplified.

You cannot. 48% to the nearest whole number is zero.

45 percent = 0.45 in decimal and it cannot be converted into a whole number

To convert percentage to a fraction divide the percentage by 100 and then simplify, if possible. 67% = 67/100 (which cannot be simplified further).

No you cannot. You cannot convert 0.45% as 1%. Only values that are greater than or equal to 0.51% can be rounded off to the next number. Hence 64.51 or more can be rounded as 65

21% is a fraction between 0 and 1. It cannot be converted to a whole number.

147% as a decimal fraction, is 1.47 and that cannot be simplified.

They are not in the same class -- like comparing apples with grasshoppers; you cannot convert % to grams. Grams [g] can be converted to kilograms [kg], pounds [lb] or ounces [oz]. Percent is a dimensionless quantity, because 100% = 1 (one), with no units. ====================================

This question cannot be answered sensibly. A kilometre is a measure of distance, with dimensions [L]. A percent is a pure ratio, with no dimensions. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information.

Acid

A transformer cannot convert AC into DC.

You cannot convert a file into a folder!

You cannot convert a decimal into a decimal!

You cannot convert 200mL to moles.

A mechanical wave cannot go to the solar system . But a electromagnet can go all around the world!

You cannot convert a transformer into a generator.