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1. 排列方式

1. ### Fluid mechanics

(1) Area of gate = 2 x 1.5 m^2 = 3 m^2 Depth of centroid of gate from water surface = (3 + (1.5/2)sin(25)) m = 3.317 m Pressure at centroid = 1000 x 9.81 ...

2. ### Fluid mechanics

Angle between AB and the horizontal = arc-tan(1.5/2) degrees = 36.87 degrees Lenth of AB = square-root[1.5^2 + 2^2] m = 2.5 m The centroid of AB is at its ...

3. ### Fluid mechanics

Distance of centroid of semi-circle from bounding diameter = 2 x 2/3.pi m = 0.4244 m Distance of upper semi-circle centroid from top of tank = (1 - 0.4244) ...

4. ### Fluid mechanics

Force due to water acting on the gate = 1000 x 9.81 x (h/2) x (1.25 x h/sin(75)) = 6348h^2 where 1000 kg/m^2 is the density of water 9.81 m/s^2 is the ...

5. ### Fluid mechanics

Dept of A below surafce of water at the left hand side of the gate = (4 - 2.sin(60)) m = 2.268 m Upward thrust acting on the gate by the water to its left ...

6. ### physics mechanics

Fan 吹出來的風會使到 trolley 受到一個向右的力。但當風吹在 card 上又使 trolley 受到一個向左的力，如果理想的話，两個力會相消，trolley 唔郁，現實可能向右方郁 ...

7. ### PHYSICS(MECHANICS)

(a) Change of momentum of the ball = (140/1000) x (-39 - 39) kg.m/s = -10.92 kg.m/s Because impulse = change of momentum, thus magnitude of impulse = 10.92 ...

8. ### physics(mechanics)

Let L be the length of the rope. Use conservation of energy, (1/2)mv^2 = mgL where v is the speed of the bob at the lowest position g is the acceleration ...

9. ### Physics(mechanics)

...igloo surface = R - R.cos(a) = R(1 - cos(a)) By conservation of mechanical energy, (1/2)mv^2 = mg.R(1-cos(a)) v^2 = 2gR(1 - cos(a)) Thus...

10. ### Phy(mechanics)

Work done by gravitational force = 3g x (10 - 2) J = 240 J Distance travelled by the stone along the plane = (10 - 2)/sin(30) m = 16 m Frictional force = ...