QUESTION 19 You are swinging a tin can around your head in a perfectly horizontal circle of radius 4 m. (This is really not possible but we're saying it almost happens and we'll assume that the motion is a circle for simplicity.) If the speed of the can is 4 m/s and its mass is 2 kg, what inward force is required to keep the can moving in the circle? O A. 16 N O B. 2 N O C. 1/16 N O D. 8 N QUESTION 20 Some engineers have suggested that we can simulate gravity in outer space by having a circular rotating space station where persons feel an outward directed fictitious force due to the rotation of the station. The reason they feel such a force is because O A. their velocity is away from the center of the space station and their inertia tends to make them move in towards the center. O B. they are accelerating toward the center of the space station and inertia tends to keep them moving sideways. O C. their velocity is toward the center of the space station and their inertia tends to keep them moving outward. O D. the fictitious force is always in the direction of centripetal acceleration