Describe how to calculate the following aspects of a mechanical system:
a) mechanical advantage
b) efficiency
c) speed ratio
Is it possible for a machine to be 100% efficient? Explain your answer.
Calculate the work done by a student doing 10 chin-ups. Assume that the student exerts a force of 400 N with arms that are 0.5 m long.
Describe how you could measure the efficiency of a bicycle.
A pulley system allows a load of 625 N to be lifted by a 90-N input force. What is the mechanical advantage of the pulley system?
Imagine that you work in a company that builds robots. You are asked to design a robot with hydraulic arms that can help out in the home.
a) List some of the activities that this robot could use its hydraulic arms for.
b) Why would hydraulic arms be better for these activities than mechanical arms without hydraulics?