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The weight of an elephant is 6000kg, and the landing area of each foot is 600cm2. Try to calculate the pressure of the elephant on the ground when standing. (G is 10N / kg)
The pressure of elephant on the ground: F = g = mg = 6 × 103kg × 10N / kg = 6 × 104n, the area of elephant's four feet: S = 4 × 600cm2 = 2400cm2 = 0.24m2, the pressure of elephant on the ground: P = FS = 6 × 104n0.24m2 = 2.5 × 105Pa
The crawler is a bulldozer with a mass of 1.5 * 100000, and the contact area between each crawler and the ground is 1.25m2 (1)
Xiaoqiang lifts a 120N object with a pulley block at a constant speed and moves 6m at the free end of the rope within 2S. The mechanical efficiency of the pulley block is 80 / 100 (1) the work and power of Xiaoqiang (2) the tension of Xiaoqiang acting on the free end of the rope (analysis)
P=F/A=1.5*100000*9.8/1.25*2=588000Pa.
The weight of a terracotta warriors and horses is 1600n, and the area of the underground pedal is 1.6 × 10-2 square meters (G is 10N / kg)
From g = mg, M = g / g = 1600n / 10g = 160kg; pressure: P = f / s, in the horizontal plane, f = g, i.e. P = 1600n / 160m2 = 10 PA
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- 4. The weight of an elephant is 5000 kg, and the area of each foot is 600 square cm
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- 11. The two solid cubes have the same pressure on the horizontal plane, and the relationship between their density is The two solid cubes have the same pressure on the horizontal plane, and the relationship between their density is P1 > P2 (the letter of density will not be printed, instead of P). If the pressure of the two cubes on the horizontal ground is F1 and F2 respectively, then F1 is the same_________ F2 (greater than, less than, equal to) Why?
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- 17. A cube solid iron block with a mass of 7.9kg is placed in the center of a horizontal tabletop with an area of 0.5m2. What is the pressure of the iron block on the tabletop? (the density of the iron is 7.9 × 10 & # 179; kg / M & # 179;, g = 10N / kg)
- 18. There is a long, wide, high 20cm, 10cm, 5cm rectangular wood block. When it is placed horizontally, vertically, and laterally, the ratio of its pressure on the desktop () and the ratio of its pressure ()
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