Monday, 11 August 2014
After both strips are heated, it is observed that Metal B expanded more than Metal A . This is due to Metal B having more electrons than Metal A to allow transfer of Thermal energy to take place more quickly in B. When transfer of thermal energy takes place more quickly, Metal strip B will expand first, pulling metal A along, resulting in a bend. A bend means one metal expanded faster than the other.
When cooled, it is observed that Metal B lose thermal energy at a faster rate than A since B had more electrons. This allowed Metal B to contract back to its original position first, pulling the bent Metal A along. Thereofore, the strip is straightened.
Friday, 1 August 2014
Since gas expands faster than solids, the rate of EXPANSION of the air space would be faster than the rate of expansion of the ring, causing the air in the space to push A outwards, widening the gap for ball to pass through.
Since gas contract faster than solids, the rate of contraction of the air space would be faster than the rate of contraction of the ring. Hence, the ring becomes thinner, the air space would be smaller for ball to pass th.
Conclusion: Heat the ring.
Kinetic Theory(MICROSCOPE) LAW
Whether it is solid/liq/gas, the theory says looking at these through a microscope you can only see molecules. Molecules are always MOVING.
SOLID MOLECULES CANNOT MOVE, THEY CAN ONLY VIBRATE.(ABOUT A FIXED POSITION) >>Motion
LIQ MOLECULES can MOVE
GAS MOLECULES(distance a lot, move very fast)
Density SAME. (Amt of substance is same; the factor that tells apart the motion of 3 states is the size of part)
Temperature is the measurement of the av kinetic energy.
Heating take place
Molecules move faster--> temp higher(50degrees)
At absolute Zero, the mole will not freeze. The mole will just stop moving. (273degrees)