The density of a brick is 2.5 × 10 cubic kg / m3, and the maximum pressure it can bear is 7.35 × 10 quintic PA The maximum pressure that the ground can bear is 1.5 × 10 cubic Pascal?

The density of a brick is 2.5 × 10 cubic kg / m3, and the maximum pressure it can bear is 7.35 × 10 quintic PA The maximum pressure that the ground can bear is 1.5 × 10 cubic Pascal?

h=P/ρg=5×100000Pa/(2×10³kg/m³×10N/kg)=25m

An elephant weighs 6 × 104 cattle, and the contact area between each foot and the ground is 600 cm 2. How much pressure does the elephant exert on the ground when it stands on four feet? How much pressure does the elephant exert on the ground when it raises two feet?

F=G=6×10^4N
When standing on the ground with four feet, s = 600cm2 × 4 = 2400cm2 = 0.24m2
p=F/s=6×10^4N /0.24㎡=2.5×10^5Pa
When standing on the ground with two feet, s = 600cm2 × 2 = 1200cm2 = 0.12m2
p=F/s=6×10^4N /0.12㎡=5×10^5Pa

1. When the elephant stands on four feet, the pressure on the ground is 2.5 × 10 quintic PA, and the contact area between each foot and the ground is 600 square cm?
1. When the elephant stands on four feet, the pressure on the ground is 2.5 × 10 quintic PA, and the contact area between each foot and the ground is 600 square cm?
2. The weight of the actor is 475n, and the contact area of one toe to the ground is 9.5 square centimeter?
3. The bottom area is 20 square centimeter, and the mass is 500 g. when the cup is filled with 400 square centimeter water and placed on the horizontal table of 200 square centimeter, what is the pressure on the table?
4. Cube A and cube B are overlapped, and the gravity is 10N and 20n respectively. One side area of cube A and cube B is 100cm2 and 200cm2 respectively. What is the pressure of cube a on B and that of cube B on the ground?

1,2.5 × 10 fifth power × 600 = 1.5 × 10 ninth power
2,475/9.5=50pa
3,(5+4)/20=0.45pa
4,10/100=0.1pa (10+20)/200=0.15pa