PLZ HELP I WILL GIVE BRAINLIESTWhich of the following statements is true? The ratio of work output to work input is always less than one. Only a few machines are 100 percent efficient. Efficiency is calculated by multiplying work input and work output. Some machines are frictionless.

How does friction with the atmosphere affect the speed of an artificial satellite

Si el equipo no fuera bueno no con el entrenador.

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2