Salisbury University
posted by Cara on .
How long will it take a 480 N motor to lift a 335 kg piano to a sixthstory window 15.0 m above?

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480 N is not a power specification. It is a force specification. Newtons (N) measure force.
You need a specification of motor power (such as horsepower or Watts) to answer this question. Any motor can provide an arbitrary force by using levers or hydraulic pistons for mechanical advantage. 
Show that 480 W of power is expended by a weightlifter when lifting a 60kg barbell a vertical distance of 1.2 m in a time interval of 1.5 s.

5m