Ago-cart travels around a flat, horizontal,
circular track with a radius of 25 meters. the
mass of the go-cart with the rider is
200. kilograms. the magnitude of the maximum
centripetal force exerted by the track on the
go-cart is 1200. newtons.
which change would increase the maximum
speed at which the go-cart could travel without
sliding off this track?
(1) decrease the coefficient of friction between
the go-cart and the track.
(2) decrease the radius of the track.
(3) increase the radius of the track.
(4) increase the mass of the go-cart.

Amachinist turns the power on to a grinding wheel, at rest, at time t = 0 s. the wheel accelerates uniformly for 10 s and reaches the operating angular velocity of 96 rad/s. the wheel is run at that angular velocity for 40 s and then power is shut off. the wheel slows down uniformly at 1.5 rad/s2 until the wheel stops. in this situation, the time interval of deceleration is closest to:

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm

How are positive ions different from neutral atoms