A new Thai elephant, weighing 6×10.3 kg, with a total area of 0.06 m2, was introduced to Guangzhou Zoo. During transportation, the staff
(1) The gravity on the elephant is g = mg = 6×103kg×10n/k

A new Thai elephant, weighing 6×10.3 kg, with a total area of 0.06 m2, was introduced to Guangzhou Zoo. During transportation, the staff

(1) The gravity on the elephant is g = mg = 6×103kg×10n/kg = 6×104n;

(2) The pressure of the elephant on the ground is p = f s = g s = 6×104N0.06m2 =1×106pa;

(3) The work w done by the crane to the elephant is useful = GH = 6×104n× 2m =1.2×105j;

(4) The total work done by the motor is w = Pt = 5×104 w× 4s = 2×106j;

(5) The crane's efficiency η= W, which is always useful, w =1.2×105j2×106j = 60%.

(1) The gravity on the elephant is 6×104n;

(2) The pressure of the elephant on the ground is1×106 Pa;

(3) The work done by the crane on the elephant is1.2×105j;

(4) The total work done by the motor is 2×106j;

(5) The efficiency of the crane is 60%.

A new Thai elephant, weighing 6×10.3 kg, with a total area of 0.06 m2, was introduced to Guangzhou Zoo. During transportation, the staff(1) The gravity on the elephant is g = mg = 6×103kg×10n/k