An elevator is constructed using an electric motor at the top which is used to lift the elevator's car via a cable. the cable weighs 6 pounds per foot. the cable is 100 feet long when the elevator car is at the first floor, and it is effectively 0 feet long when the car is at the top floor. the elevator's car weighs 500 pounds how much work w does the motor do just lifting the cable and car when it takes the car from the first floor to the top floor

Which features on mars point to the possibility of liquid water on the planet? impact craters with sharp rims volcanic cones with craters gullies and stream-like channels mountain ranges with faults

A( developed during the process of technology design

Two loudspeakers, 5.5 m apart and facing each other, play identical sounds of the same frequency. you stand halfway between them, where there is a maximum of sound intensity. moving from this point toward one of the speakers, you encounter a minimum of sound intensity when you have moved 0.33 m . assume the speed of sound is 340 m/s.part a) what is the frequency of the sound? part b) if the frequency is then increased while you remain 0.21 m from the center, what is the first frequency for which that location will be a maximum of sound intensity? express your answer to two significant figures and include the appropriate units.