For centuries, people have tried to invent perpetual motion machines to move water uphill or to do other work without an external energy source.  Why have these attempts always failed?

A. first and second laws of thermodynamics
B. law of conservation of matter
C. lack of scientific understanding
D. inadequate technological advancement


Answer: A

Environmental & Atmospheric Sciences

You might also like to view...

Which of the following earth materials would you expect to have the lowest porosity?

A. Sandstone B. Clay C. Sand and gravel D. Fractured limestone E. Unfractured granite

Environmental & Atmospheric Sciences

The average speed of a ball rolling along a horizontal track will be increased if the track

A. has a dip along it. B. has a hump along it. C. both of these D. not enough information

Environmental & Atmospheric Sciences

Culture is found only among ethnically homogeneous groups

Indicate whether this statement is true or false.

Environmental & Atmospheric Sciences

Which of the following represents the "three Rs" of waste disposal in the descending order of energy expenditure?

A. Reuse, reduce, recycle B. Reduce, recycle, reuse C. Recycle, reduce, reuse D. Recycle, reuse, reduce E. Reuse, recycle, reduce

Environmental & Atmospheric Sciences