Physical calculation problems (with process and formula) 4、 Calculation questions (29 questions, 9 points for each question, 30 questions, 10 points, 19 points in total) 1. A brick can bear the maximum pressure of 2x105pa, and the contact area between the brick and the ground is 300 cm2. How much pressure can you stack bricks on this brick? 2. There is a reservoir with a dam height of 120m, and the current water level in the reservoir is 100m. What is the pressure of water on the dam bottom? 3. There is a cube with a side length of 2m. How much pressure does atmospheric pressure exert on the upper surface? 4. The gravity of an object is 10N, and its pull force is 6N in water 1. How buoyant is the object? 2. What is the volume of boiled water? 3. The mass of the object? 4. The density of the object?

Physical calculation problems (with process and formula) 4、 Calculation questions (29 questions, 9 points for each question, 30 questions, 10 points, 19 points in total) 1. A brick can bear the maximum pressure of 2x105pa, and the contact area between the brick and the ground is 300 cm2. How much pressure can you stack bricks on this brick? 2. There is a reservoir with a dam height of 120m, and the current water level in the reservoir is 100m. What is the pressure of water on the dam bottom? 3. There is a cube with a side length of 2m. How much pressure does atmospheric pressure exert on the upper surface? 4. The gravity of an object is 10N, and its pull force is 6N in water 1. How buoyant is the object? 2. What is the volume of boiled water? 3. The mass of the object? 4. The density of the object?

1. A brick can bear a maximum pressure of 2x105pa, and the contact area between the brick and the ground is 300 cm2. How much pressure can you stack bricks on this brick
F=PS=
2. There is a reservoir with a dam height of 120m, and the current water level in the reservoir is 100m. What is the pressure of water on the dam bottom?
ρ is the density of water and H is the water level
P=ρgH=
3. There is a cube with a side length of 2m. How much pressure does atmospheric pressure exert on the upper surface?
P is atmospheric pressure and S is upper surface area
F=PS=
4. The gravity of an object is 10N, and its pull force is 6N in water
1. How buoyant is the object?
F = G-F = 10-6 = 4N
2. What is the volume of boiled water?
F-float = ρ GV row, so v-row = f-float / ρ G=
3. The mass of the object?
m=G/g=1Kg
4. The density of the object?
V = V row ρ = m / V=
Formulas are given out, the specific number of their own out of the results