In one amusement park ride, riders enter a large vertical barrel and stand against the wall on its horizontal floor. the barrel is spun up and the floor drops away. riders feel as if they are pinned to the wall by a force something like the gravitational force. this is a fictitious force sensed and used by the riders to explain events in the rotating frame of reference of the barrel. explain in an inertial frame of reference (earth is nearly one) what pins the riders to the wall, and identify all of the real forces acting on them.

An object is 10 cm from the mirror, its height is 1 cm and the focal length is 5 cm. what is the image height? (indicate the object orientation by including the + or - sign with the answer.) hi = cm +1 -1 +10 -10

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?