Compare between strengthening in single crystalline and polycrystalline metals 23. state the mechanisms in which the strength of polycrystalline metals can be improved 24. compare between strain hardening and work hardening

•• al and bert are jogging side-by-side on a trail in the woods at a speed of 0.75 m/s. suddenly al sees the end of the trail 35 m ahead and decides to speed up to reach it. he accelerates at a constant rate of 0.50 m/s2, while bert continues on at a constant speed. (a) how long does it take al to reach the end of the trail? (b) once he reaches the end of the trail, he immediately turns around and heads back along the trail with a constant speed of 0.85 m/s. how long does it take him to meet up with bert? (c) how far are they from the end of the trail when they meet?

Because light travels in a straight line and casts a shadow, isaac newton hypothesized that light is

Which one of the following research methods can show cause and effect