The force that one needs to apply on a machine to perform a task

A force is needed to:

Mary and Nancy can each perform a certain task in m and n hours, respectively. Is mltn ? (1) Twice the time it would take both Mary and Nacny to perform the task together, each working at their respective constant rates, is greater than m. (2) Twice the time it would take both Mary and Nancy to perform the task together, each working at their respective constant rates, is less than n.

A coolie is pushing a box weighing 1500 N up an inclined plane 7.5 m long on to a platform, 2.5 m above the ground. In actual practice, the coolie needs to apply more effort than what is calculated. Give one reason why you think the coolie needs to apply more effort.

What force, in newton, your muscles need to apply to hold a mass of 5 kg in your hand ? State the assumption.

A machine gun fires 10 bullets per second in horizontal direction. Mass of each bullet is 80g and muzzle velocity is 500m//s . If the average horizontal force the shooter must apply to keep the machine gun stationary is Fxx10^(2)N , find numerical velue of F

Is force needed to keep a moving body in motion ?

Mr. A, B and C are trying to put a heavy piston into a cylinder at a mechanical workshop in railway yard. If they apply forces F_(1), F_(2) and F_(3) respectively on ropes then for which set of forces at that instant, they will be able to perform the said job?

To isolate protoplast, one needs

To isolate protoplast, one needs

To isolate protoplast, one needs