A 2 meter high inclined plane with a length of 10 meters allows you to move a box that weighs 750 newtons with a force of 187.5 newtons.  Calculate the efficiency of the inclined plane.

Ace Industries has a 50 kW air compressor that operates at full-load (LF = 1), all day for 365 days per year. the motor for the air compressor cost €1400, the motor efficiency is 90%, and electricity costs €7.00/kW/month and €0.10/kWh, how much does it cost to operate the air compressor for one year?

9) A person in good physical condition can put out 100 W of useful power for several hours at a stretch, perhaps by pedaling a mechanism that drives an electric generator. Neglecting any problems of generator efficiency and practical considerations such as resting time, answer the following.   (a) How many people would it take to run a 3.00 kW electric clothes dryer? _____ people   (b) How many people would it take to replace a large electric power plant that generates 800 MW?  _____people

An inclined plane at an angle of 15o is used to lift a 250 kg sofa through a vertical height of 5 meters.  If the coefficient of kinetic friction is 0.12, what is the Mechanical Advantage, Ideal Mechanical Advantage, and efficiency of the plane?

Shoveling snow can be extremely taxing since the arms have such a low efficiency in this activity. Suppose a person shoveling a footpath metabolizes food at the rate of 750 W. (The efficiency of a person shoveling is 3%.) (a) What is her useful power output (in W)?  Answer________________ W (b) How long (in s) will it take her to lift 2600 kg of snow 1.20 m? (This could be the amount of heavy snow on 20 m of footpath.)  Answer________________   s (c) How much waste heat transfer in kilojoules will she generate in the process?  Answer________________  kJ

The figure below is that of an object being pushed up an incline. The object has mass of m - 4.9 kg and it is pushed up the incline with a force of F= 26.0 N to the top at a constant speed. The incline is 12-meters long and h 3.1 meters high. Based on this information, please determine the efficiency for this inclined plane to three decimal places. Enter your answer as a decimal, not a percentage (0.224 and not 22.4%) Your Answer: 12.0 m F E

An elevator has an electrical power rating of 3.2 x 104 W.  If the elevator takes 42 s to move up 3 floors (12 m total), what is its efficiency?  Assume the mass of the elevator and its passengers is 1800 kg.