Uber has a secret 800 number for emergencies share tweet Linkedin Reddit Pocket Flipboard Email Uber has an emergency phone number for passengers and drivers to get in touch with a human employee at the ride-hail company, according to a report in Inc. Thursday. The number, which has been...  The number, which has been operational since October, is only available in 22 cities and is only intended for non-911 related emergencies.
An actuator is a type of motor that is responsible for moving or controlling a mechanism or system. It is operated by a source of energy, typically electric current, hydraulic fluid pressure, or pneumatic pressure, and converts that energy into motion. An actuator is the mechanism by which a control system acts upon an environment. The control system can be simple (a fixed mechanical or electronic system), software-based (e.g. a printer driver, robot control system), a human, or any other input.
Mechanical actuators typically convert rotary motion of a control knob or handle into linear displacement via screws and/or gears to which the knob or handle is attached. A jackscrew or car jack is a familiar mechanical actuator.