Machines

The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58kg mass a height of 3.0m? A person lifts a 950 N box by pushing it up an incline. If the person exerts a force of 350 N along the incline, what is the mechanical advantage of the incline? A 0.100 kg meterstick is supported at its 40.0 cm mark by a string attached to the ceiling. A 0.700 kg mass hangs vertically from the 5.00 cm mark. A mass is attached somewhere on the meterstick to keep it horizontal and in both rotational and translational equilibrium. If the force applied b... click for more

Machines

1. A 0.100 kg meterstick is supported at its 40.0 cm mark by a string attached to the ceiling. A 0.700 kg mass hangs vertically from the 5.00 cm mark. A mass is attached somewhere on the meterstick to keep it horizontal and in both rotational and translational equilibrium. If the force applied by the string attaching the meterstick to the ceiling is 19.6 N, determine the following: a. the value of the unknown mass b. the point where the mass attaches to the stick 2. The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height ... click for more

interrupted pendulum

My professor was trying to explain the concept of the interrupted pendulum. I do not understand why most pendulums have the same period and why, when you interrupt a pendulum it will still reach the same height.

Lead tests

Hello can you please tell me how i can test lead levels in water to give a quantative result not just whether lead is preasent or not. can you also tell me where to get lead testing equiptment, note we have a colormeter at college i need a equiptment list and a list of chemicals and a method thanks emma

Unable to work out Newtonian force

my question is What force would be required to decelerate a 3800 kg vehicle uniformly from 60mph to zero in 2 seconds