HELP PLZ AND THANK U A system with one fixed and one movable pulley operates with 90% efficiency. The movable pulley has a weight of 5 N. Using this pulley system, what is the minimum input force needed to lift a piano weighing 1,595 N?

20. threshold braking in the vehicle's braking system occurs when a. the brake pedal is pushed, heel on floorboard, with full foot pressure. b. the brakes are exerting full braking power, without traction loss. c. the driver begins pushing down the brake pedal, with moderate slowdown. d. the brakes just begin to take hold with a gradual slowdown.

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

Which type of basaltic lava flow has a fairly smooth