An electric elevator with a motor at the top has a multistrand cable weighing 3.5 lb/ft. when the car is at the first floor, 160 ft of cable are paid out, and effectively 0 ft are out when the car is at the top floor. how much work does the motor do just lifting the cable when it takes the car from the first floor to the top?

Why don't you see your reflection in water with waves or repples

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.

Language is not the only way that humans communicate. describe how we use sound, touch, chemicals, and sight to communicate. need answer asap