Is this true or false? The secret to walking for fitness is shifting from a regular walk to one with a more athletic and powerful pace.

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

What makes thermal imaging cameras useful? they can detect differences in color. they can detect differences in wave speeds. they can detect differences in temperature. they can detect mechanical waves.

What is the energy of a photon of ultraviolet radiation with a frequency of 4.4 × 1015 hz? planck’s constant is 6.63 × 10–34