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1. ### S4 Physics Apparent Weight

...solve for a gives a = 2.22 m/s^2 since a is +ve, the lift is moving up with an acceleration. Should the lift... = 350 N The reading on the scale would be lower than her...

2. ### question about friction (AL)

... the reason why the brake pads would get hot in frequent braking. However...in hard braking, the wheels silde on the road surface. Thus producing a large amount of heat by friction. The kinetic...

3. ### １蚊銀 ～ 由 國金二期頂層投下 ～ 要幾耐？

...good if the coin is not moving too fast. Using ...ma The terms on the LHS is the...derivative of h with respect to time) a = d2h/dt2 (second...one can solve it, one can get practically all information about...

4. ### 為什麼物體遇熱會熔化?

...and at the same time they have got sufficient energy to overcome the...intermolecular attractive force. As a result, separation between these..., they increase in volume on heating. When...certain extent and become free to move . The free motion of these...

5. ### aerofoil in Physics

...downward force when the vehicle is moving =mg + f, where f is the force...ma into the above equation, we have a = u(mg + f)/m = u.g + u.f/m ... velocity dependent. It gets smaller when the speed of the...

6. ### 非一般的物理題(2)

... to write F = m dv/dt. Rather, we have a variable m m = mr / √(1 - v²/c²...) ...(2) Rearranging (2), we can easily get v = p c / √[ (mr c)² + p²] ...(3...

7. ### Mechanics: Find the frictional force

...plane,therefore the friction acting on the block points upward,as it...slope) When the block is moving up,both the weight compoent and the frcition... two equations,we get 2f=-ma f=-ma/2= x 2.66666.... / 2...

8. ### conservation of momentum

... (1) and (2) or (1") and (2),we get two results I think you...1),to left,use (1") 1b)average force on the black ball=(change in momentum of black...2x10h) h=154m 2b)By s=ut+(0.5)( a )(t^2) s=[(200x1000)/3600]+(0.5)(-10)(1.5...

9. ### 互動接吻「海報」， 勢成宅男新寵？

簡直偉大發明 , 但我在四十多年前已有此幻想 , 可謂出產太遲 , 由少年已變成中年阿叔。

10. ### Newton second law

1. By F=ma, 12000 - 2000 = 2000a a = 5ms^-2(downwards) By s= ut+1/2at^2, s = 0(7) + 1/2(5)(7... You should apply 210N upwards in order to pull the bucket up at a constant velocity 3b. I am not sure for this question..... Is the magnitude...

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