01:55Object dropped into a cart final speed: momentum conservation hay bail dropped into cart physics.Zak's Lab88
Multiple ChoiceA 40-kg skater runs parallel to a 3-kg skateboard. Both are moving to the right at 10m/s. The skater jumps on the board, and they move continue moving right (i.e. no change in direction). Calculate the final speed of the system.4658Has a video solution.
Multiple ChoiceA 2.4 kg metal disk is horizontal and is spinning at 30 rpm. A second disk with the same radius, but with a mass of 5.2 kg is initially not spinning and is lowered gently onto the spinning disk. The system of the two disks is then isolated, such that there is no external torque on it. The disks scrape against each other until they are moving with the same speed. What is the final rotational speed of the disks, in rpm?191
Textbook QuestionThree identical train cars, coupled together, are rolling east at speed v0. A fourth car traveling east at 2v0 catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples to make a five-car train. What is the speed of the five-car train?76Has a video solution.
Textbook QuestionA 10-m-long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 30 m/s when a 60 kg skydiver drops out by releasing his grip on the glider. What is the glider's velocity just after the skydiver lets go?58Has a video solution.
