On an amusement park ride, riders stand inside a cylinder of radius 7.0 m. at first the cylinder rotates horizontally. then after the cylinder has acquired sufficient speed, it tilts into a vertical plane, as shown in the diagram. at top speed, the cylinder rotates once every .

When seismic waves hit a fault, the waves are reflected off the fault. seismograph can detect these reflected seismic waves. geologists then use these data to map the fault's length and depth

I'm having some difficulty seeing the diagram clearly.but the question says there's a net inward force on the object.so we know right away,  from newton's 2nd law of motion, thatthat baby is accelerating.  it doesn't even matter which way thenet force is pointing.  if there's any net force, then either theobject's speed or else its direction must be changing.