GPHY 101 Lecture 15: Geography of Obesity, Comparative Healthcare

A solid, uniform disk of radius 0.250 m and mass 48.2 kg rolls downa ramp of length 3.90 m that makes an angle of 14.7° with thehorizontal. The disk starts from rest from the top of theramp.
(a) Find the speed of the disk's center of mass when it reaches thebottom of the ramp.
1
Your response differs from the correct answer by more than 100%.m/s

(b) Find the angular speed of the disk at the bottom of theramp.
2
Your response differs from the correct answer by more than 100%.rad/s

A good rule of thumb is to use relativistic equations whenverthe kinetic energies determined classically and relativisticallydiffer by more than 1%. find the speeds when this occurs for (a)electrons, and (b) protons.

A good rule of thumb is to use relativistic equations whenever the kinetic energies determined classically and relativistically differ by more then 1%. Find the speeds when this occurs for (a) electrons and (b) protons.