Home Physics PHYSICS: A Textbook for Grade 10 Chapter 3: Work, Energy and Power
1.
What do we mean when we say that a certain machine is 98 percent efficient?
The machine multiplies an input force by a factor of 98
The machine multiplies an input energy by a factor of 98
The machine wastes 2 joules of an input energy
The machine wastes 2 percent of an input energy