Athin hoop of mass m and radius r rolls without slipping down a ramp with height h. it then rolls onto a flat frictionless surface (where it can slip) and impacts a spring with spring constant k. assuming there is no friction between the hoop and the spring, what is the maximum compression of the spring?

Positrons are spontaneously emitted from the nuclei of

Your science teacher brings in a speaker to talk to your class about climate change. during the session, students ask a few questions. which questions are related to the current evidence on climate change

At 20∘c, the hole in an aluminum ring is 2.800 cm in diameter. you need to slip this ring over a steel shaft that has a room-temperature diameter of 2.804 cm . 1. to what common temperature should the ring and the shaft be heated so that the ring will just fit onto the shaft? coefficients of linear thermal expansion of steel and aluminum are 12×10−6 k−1 and23×10−6 k−1 respectively.