3) (a) What is the mechanical advantage of a wheelbarrow, such as the one in Figure 1, if the center of gravity of the wheelbarrow and its load has a
perpendicular lever arm of 5.50 cm, while the hands have a perpendicular
lever arm of 1.02 m? (b) What upward force should you exert to support the
wheelbarrow and its load if their combined mass is 55.0 kg? (c) What force
does the wheel exert on the ground?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?