An athlete can press horizontally with a maximum force of
PHYSICS · Subjective · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion
Problem
An athlete can press horizontally with a maximum force of 350N. She tries to open a stuck door by pushing perpendicular to its plane at the usual handle, which is 0.80m from the hinge line.
(i) Calculate the greatest turning moment she can produce about the hinges at this position.
(ii) The door requires a minimum turning moment of 420Nm to start moving. Determine how far from the hinge line she must push (still perpendicular to the door) to achieve this requirement with her maximum force.
(iii) Comment on whether an ordinary door of width 0.90m would allow her to apply the needed turning moment without the use of an auxiliary tool such as a lever extension.