this graph shows the acceleration of particles a and b. the two lines intersect each other at point o. what is the acceleration of particles a and particle b at point o?
it is 0.2 m/s2 for particle a and 0.05 m/s2 for particle b.
it is 0.65 m/s2 for both particles.
it is 0.68 m/s2 for both particles.
it is 2 m/s2 for particle a and 0.50 m/s2 for particle b.

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.