In an area in which electricity costs 8 cents/kilowatt-hour, a 5 kw clothes dryer runs for 90 minutes to dry a load of laundry. how much did it cost to dry these clothes?
these are the choices
$0.20
$0.30
$0.45
$0.60

A6,600 kg train car moving at +2.0 m/s bumps into and locks together with one of mass 5,400kg moving at -3.0m/s. what is their final velocity? +0.50 m/s -1.0 m/s +2.5 m/s -0.25 m/s

Which of the following is not a part of the respiratory system? a. pharynx b. trachea c. pancreas d. larynx

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?