A motor with a power of 75 watts is connected to a flywheel. How long, in units

Question

A motor with a power of 75 watts is connected to a flywheel. How long, in units of hours, must the motor operate to transfer 262,500 joules to the flywheel? Click the icon to view the conversion table. Click the icon to view the table of common derived units in the SI system. The motor must operate hours to transfer 262,500 joules to the flywheel. (Round your answer to two significant digits.) If the pressure is 140 pounds per square inch [psi], what is the pressure in units of inches of mercury [in Hg]? Click the icon to view the conversion table for pressure. The pressure is in Hg. (Round your answer to three significant digits.) A motor with an output power of 100 watts is connected to a flywheel. How long, in units of hours, must the motor operate to transfer 300,000 joules to the flywheel, assuming the process is 80% efficient? Click the icon to view the table of common derived units in the SI system. The motor must operate h. (Round your answer to three significant digits.)

Explanation / Answer

apply power = eenrgy/time

time = 262500/(75

time = 3500 secs

t = 3500/60 = 58.33 mins

t = 0.97 Hrs
--------------------------------------------

1Psi =2.0364 in of Hg

so 140 psi = 140 *2.306

= 286 in of Hg

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