Answer:
C. Overcome Friction
Explanation:
When using any machine usually those with moving parts, you may notice heat forming near the areas where most movement occurs. As friction continues, more energy is used up and released as heat. For that reason, the efficiency of a machine will forever be less than 100%
Answer:
HERE'S MY UNDERSTANDING OF THE DIFFERENCE
Looks like you simply substitute the length of the femur
Answer is on the image with the explanation. I hope that might help you with the answers
Answer: For ideal machine efficiency = 1. Hence M.A = V. R. The V. R of an ideal machine and the practical machine is a constant or is the same for both