Power of the machine if it is 100% efficient.

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

Question 15) An elevator motor is moving an empty elevator upwards at a speed of 5.0 mis, as shown below. The power input to the motor is 4.0 kW. The motor is 7U 5 efficient

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

How high can a 195 kg object be lifted using 14,082 J of work?   Round your answer to the nearest hundredth>

The "efficiency" of a machine is found by determining how much of the energy you started with will be able to be used productively. True False Type here to search DELL home F11 67 F1 F10 F12 A BE Esc F2 # 3 F3 ex 54 I C F4 $ F5 % 5 90% F6 A 6 & 8 F8 00 * 8 F9 prt sc 9