1. What is the centripetal acceleration of a locomotive that travels around a circular curve of radius 250 m at a constant speed of 70 km/h? (1.5 m/s? ) 2. What is the centripetal acceleration of a small girl standing at the outer edge of a carousel 4.0 m in diameter, which makes one complete rotation in 6.0 s? (2.2 m/s?) 3. Patrons on the midway ride called the Rotor stand with their backs against the wall of a revolving cylinder, while the floor drops away from beneath them. To keep from falling, they require a centripetal acceleration of about 25 m/s'. If the rotor has a diameter of 5.0 m, with what minimum frequency does it revolve? (The vertical force required to support their weight is supplied by friction with the wall.) (0.50 Hz) 4. An airplane flies in a horizontal circle of radius 500 m. If its centripetal acceleration is 20 m/s', how long does it take to complete the circle? (31 5)