Can you make the work output of a machine greater than the work input?

a) yes, by decreasing friction
b) no, work input and work output are always equal
c) no, work output is always less than work input
d) yes, by increasing the input force

Why can blue light and yellow light combine to produce white light? question 17 options: they are both primary colors of light. they absorb each other's wavelengths. because blue, yellow, and white are primary colors. they are complementary colors of light.

What are known as the properties of substances that describe a substance et does not change that substances?

How do i solve this physics problem?