Aring made from brass has an inner radius of 2.5 cm and an outer radius of 3.5 cm, giving the ring a thickness of 1. cm. the thermal expansion coefficient of brass is 0.19/°c. if the temperature of the ring is increased from 20.0°c to 90.0°c, by how much does the thickness of the ring change? cm

0.00133 cm

Explanation:

Given

change in temperature

Thermal Expansion coefficient of brass

thickness t=1 cm

change in thickness is given by

pe = weightxheight = 2000x1000=2,000,000joules

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.