Solution: (1) Measure the distance of 10 step along a straight line with a scale, and divide it by 10 to get the step distance;

(2) The length of the teaching building is x=0.5m×84=42m.

His walking speed is: v = =1.2m/s;

(3) The rising height of the center of gravity h = 65 cm-cm = 5 cm = 0.05 m;

w = Gh = mgh = 50k g× 10N/kg×0.05m = 25J；

(4) The movement of limbs consumes energy; The contraction and stretching of body muscles consume energy; The heart consumes energy to promote blood circulation; The human body needs energy to dissipate heat.