The small slider of mass m = 0.76 kg is released from rest while in position a and then slides along the vertical-plane track. the track is smooth from a to d and rough (coefficient of kinetic friction μk = 0.24) from point d on. determine (a) the normal force nb exerted by the track on the slider just after it passes point b, (b) the normal force nc exerted by the track on the slider as it passes the bottom point c, and (c) the distance s traveled along the incline past point d before the slider stops. the distance r = 1.32 m.

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it